E28 M30 "Big Six" Complete Engines
Korman Roadsport Suspension Systems
Our best selling suspension package is comfortable enough for daily use, yet provides substantially improved handling for winding roads and weekend club events. Kits includes four shorter, stronger springs, adjustable front and rear anti-sway bars with polyurethane bushings, and Bilstein Heavy Duty shocks front and rear.
Competition Adjustable Anti-Sway Bar End Links
Allows for custom tuning of front and rear anti-sway bar pre-load to suit specific track layouts. Light weight aluminum threaded centers connect right and left hand threaded joints for quick adjustments. Front links may be used singly or in pairs.
Front Adjustable Link-P/N 3102847 (fits all E28)
Heavy-Duty Thrust Rod Bushings
The E28 chassis and front end shimmy go hand in hand, especially with the addition of larger wheel and tire packages. This shimmy mimics warped rotors, and is most noticeable under light braking from highway speeds. The most common cause we see in our shop are the weak factory thrust rod bushings. These bushings are mounted at the rear of the strut rod, a diagonal link which helps prevent fore and aft wheel movement. Our hard rubber bushings address this problem as well as improving steering feel and "turn in". Sold in pairs.
All E28 P/N 3111567
Remember to check the condition of the entire front suspension as well as wheel balance/tire roundness and rotor run out/thickness when trying to diagnose a shimmy.
Aluminum Front Lower Control Arms
Stronger than the original cast steel arms and about half the weight. Reduction in unsprung weight improves handling.
All E28 P/N 31121310L (left) 3112310R (right)
Upper Decamber Plates
A pair of hardened aluminum plates with studs and bolts for easy installation. Increases front negative camber by about 3/4°. Sold in pairs.
E28 All 31062056
Strengthens chassis, minimizes strut tower deflection. Polished aluminum finish.
E28 All 3130065
Front Upper Support Bearings
Always replace when installing new front springs or shocks.
All E28 P/N 31331124508 sold each.
Offset Upper Support Bearings
Increases negative camber for improved handling and tire wear. Sold each.
All E28 3131143
Offset Rear Trailing Arm Bushings
Used to make very small corrections in rear wheel camber or toe. Sold in pairs.
All E28 P/N 332202203
Rear Subframe Camber/Toe Assembly
Our eccentrics allow adjustment of rear wheel camber and toe in just a matter of minutes. Enables the restoration of factory specified alignment settings, adjustable for racing. Sold on an exchange basis.
P/N 33203567 (camber or toe only, x 2 for both)
Big Brake Kits
High Performance Rotors
Ate POWER DISC
528e, 533i, 524td front rotors P/N 3411P151655
535i, iS front rotors P/N 3411P156143
Korman High Performance Brake Rotors
Available in either a computer controlled crossdrilled version with the holes chamfered to the wear limit, or in a computer controlled gas slotted version with the gas ports milled to the wear limit. Our rotors are then finish plated with cadmium. While nothing beats the appearance of crossdrilled rotors, we suggest using the gas slotted versions for true high performance and track use due to superior wear rates and brake cooling. Please specify crossdrilled or gas slotted when ordering.
High Performance Brake Pads
Ferodo Performance Brake Pads
Developed as a non-asbestos street alternative. Formulated with metallic fibers and other inorganic substances that yield a high friction level with good resistance to fade and wear. This competition grade compound is completely suitable for normal street use as the friction level is affected very little by temperature.
Hawk High Performance Disc Brake Pads
Korman Endurance Brake Pads
In our development of the 325 for IMSA Endurance Racing, we tested every brand name racing brake pad we could buy and then had some custom fabricated as nothing "off the shelf" would last. We finally found a custom material that was good enough to win the 24 Hours of Watkins Glen and both the Driver and Manufacturers IMSA Sport Class Endurance Championships. An added bonus is that they stop well under light street conditions, making them completely suitable for street/highway use as well as driving schools and Club Races. Sold on an exchange basis (we need your old backing plates back as cores)
Korman Racing Brake Pads
Developed for use in our IMSA E30 M3's. Good enough to win both the drivers and the manufacturers IMSA Sport Class Endurance Championships. This pad material is a non-asbestos graphite/metallic formulation. Unlike some racing materials that work well only when hot, the broad coefficient of friction of these pads also enable them to work well under cool, light braking conditions. They are therefore ideal dual purpose pads for both street and club events.
Stainless Steel/Teflon Brake Lines
Essential for driving schools and highly recommended for all high performance driving. Provides stronger pedal, improved modulation under hard brake usage. Eliminates expansion associated with rubber lines. Kit includes a full set of 6 lines.
All E28 5 series P/N 34321056
Super Blue Racing Brake Fluid
A non-silicone high performance dot 4 brake fluid designed for the extreme demands of motor racing, yet perfectly suited for street applications. Sold in 1 liter cans.
P/N SUPERBLUE (Type 200 is a yellow version of Super Blue) P/N TYPE200
K & N Air Filters
The K & N Filtercharger is unsurpassed in filtration protection, while maintaining an air flow greater that the OEM paper filter. Constructed of a pleated special cotton fabric with aluminum screen mesh and wide rubber seals, it comes pre-oiled with a one million mile warranty. When dirty, simply clean, re-oil and reinstall.
533i, 535i,iS P/N 1372332005
528e 82-86 P/N 1372332005
528e 87-88 P/N 1372332059
Big Bore Throttle Body
Bore size is enlarged 3mm for a 10% increase in throttle butterfly area. Quicker acceleration and noticeably more torque throughout the midrange and top end. Especially effective when installed along with our high performance computer chip, free flow intake and performance exhaust system. Sold on an exchange basis.
528e P/N 11610321 Core P/N 116159CORE
533i, 535i P/N 11610322 Core P/N 116163CORE
High Flow Intake System
Easy bolt on installation. Just remove the factory air filter box and install the new venturi tube. A special cone shaped K&N Filtercharger is then clamped onto the end of the venturi tube. Nice increase in throttle response, sporty induction sound.
533, 535i, iS P/N 1371KM30
Extrude Honed Intakes
The Extrude Hone process accomplishes porting and polishing throughout the complex BMW M30 and M20 intake manifolds which are inaccessible by hand tools.
ALL 6 Cylinder P/N 13EXTRUDE01
This high performance cat-back system features mild steel construction with chrome over stainless twin tips and stainless inner baffles. Deep exhaust note. Resonator and rear muffler must be purchased as a set.
Resonator P/N 1883781503
Rear Muffler P/N 1883781506
OE type replacement exhaust systems at substantial savings over factory replacements. Mounts using original hangers and hardware. 1 year warranty.
These high quality headers provide a 6-10% power increase on stock engines, much more on high performance engines. Engineered for trouble free fit and long service. Also available with ceramic thermal barrier coating (described below) for additional performance, durability and improved appearance. Headers fit manual transmission models only and include oxygen sensor fitting.
533i, 535i, iS P/N 18215138LF3
Exhaust Manifold Porting
A careful porting and polishing of the exhaust manifolds. We then precisely mate the exhaust manifold gaskets to the exhaust manifold for maximum flow. Especially effective with Ceramic Thermal Barrier Coating. An excellent alternative where headers are not an option.
All 6 cylinder P/N LAB18213006
Ceramic Thermal Barrier Coating
From Aerospace technology comes this oven baked metallic/ceramic finish that is far superior to ordinary header paints. In salt spray testing where high temperature paints lasted 40-50 hours, the ceramic coating lasted over 5,000 hours. The ceramic thermal barrier finish also coats the inside of the pipe. The thermal barrier will reduce underhood temperatures and testing has shown horsepower gains due to combustion chamber stabilization and increased gas velocity.
All 6 cylinder P/N 182110016
Korman Adjustable Short Shift Kit
Let's you select the shifter throw that suits your needs
All E28 9/85>P/N 25250003
All E28 >9/85 P/N 25250004
Lightweight Steel Flywheels
Precision machined and balanced steel flywheel. 35% lighter for reduced inertia and more rapid acceleration. Sold on an exchange basis.
533i, 535i, iS P/N 11220006
528e P/N 11220325
Precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength, heat-treated aluminum, with a steel friction surface retained by aircraft structural screws. The insert is stress relieved, blanchard ground, precision drilled, countersunk, and heat-treated. It is far superior to spray-on type friction surfaces and can be replaced when worn. Kit includes aluminum flywheel, flywheel bolts and anti-galling plate. Total flywheel weight is 8.9 lb.
528e(228mm) P/N 11121880K
Flywheel Bolts (always replace flywheel bolts when replacing the flywheel)
528e P/N 11220616143; 533i, 535i, iS P/N 11220616142
Dual Mass Flywheel Conversion-528e
The factory dual mass flywheel weighs 27.6 lbs. Our lightweight conversion weighs just 14.9 lbs. The reduction in weight allows the engine to accelerate faster at all RPM's. Our kit includes lightweight steel flywheel, Sachs H.D. pressure plate, H.D. sport disc and release bearing. Fits all 5/86 and up 528e with dual mass flywheels.
Sachs High Performance Clutch Components
We sell only quality SACHS clutch components. Heavy duty pressure plates feature increased clamping force for better performance with high horsepower engines, bigger tires, etc. The heavy duty light weight pressure plates feature the same increase in clamping force but the center plate, normally cast iron, is replaced with lightweight aluminum for even better performance. Heavy Duty Sport Discs feature a performance grade friction surface which is both riveted and bonded for greater strength.
Stock Clutch Kits
All new (no reman) kits include stock pressure plate, disc and release bearing.
533i P/N 21210000004 83-2/84
Replace your cracked rubber hose with our more durable stainless steel braided unit. Improved clutch feel and modulation when compared to OE rubber line.
Korman Manual Gearbox Rebuild
We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor.
Close Ratio Rebuild P/N 23231902
Korman Standard Differential Rebuild
Differentials with normal wear don't usually require the replacement of the ring and pinion gears. Our standard rebuild includes complete disassembly, through cleaning, close inspection of all parts, replacement of all bearings, seals gaskets, crush sleeve and lock ring. Includes meticulous attention to correct gear lash, gear contact, precise pre-load of bearings and exact torque specifications. We expect our rebuilds to last well over 100,000 miles. Note: UPS can pick up and deliver your differential at your door!
533i, 535i, iS P/N 33126082
528e P/N 33126030
Korman 75% Limited Slip Differential Conversion
If you race, autocross, rally, do BMW driving schools, or otherwise tend to push your car to the limit, let us convert your 25% limited slip differential to 75% limited slip. Wheel spin is reduced or eliminated, improving track times significantly. Additionally, the reduction in internal slippage lowers lubricant temperatures, helping prolong bearing life. The conversion requires special machining at our facility, making it necessary for you to ship your differential to us for modification.
75% Limited Slip Conversion P/N 33126375
Optional Ratio Differential Gear Sets
"My first BMW, a 1964 1800 TISA four door sedan regularly beat the performance sport cars of its day in autocrosses: E-Jaguars, Lotus Elans, Corvettes, MG Twin Cams, Porsche Super 90's, and more than a few 911's! Along with very minor engine changes, a good suspension package, wider wheels and tires, and a close ratio gearbox, my most effective "speed secret" was the change to a 4.75 gear set!"
Korman Suggested Differential Gearing
*Carrier change required
Other available gear ratios
Call us for recommendations, pricing and more information on upgrading your differential.
Hood Insulation Kits
Our self adhesive hood insulation kits are pre-cut and feature a mylar outer layer for ease of cleaning, long life, and improved appearance. Self sticking adhesive backing. State model of car when ordering.
Quartz Halogen Headlight Conversions
For off road and racing applications only. Competition proven by rally racers and off road racers around the world.
Direct plug-in replacements for your sealed beam units. No additional wiring required.
High Beam 5 3/4" Round (for 4 headlamp system) P/N 71456
Low Beam 5 3/4" Round (for 4 headlamp system) P/N 71156
© Korman Autoworks, Inc. 2629 Randleman Rd. Greensboro, NC USA 27406