Modifications
Dinan Cars makes aftermarket modifications for various models of BMW (and Minis) since 1979. For instance, the S-2 Package - for the M5 - modifies the OEM Air filtration system, air mass flow meters, independent throttle bodies, remapped ECU (Electronic Control Unit), exhaust headers, header-back exhaust system, VANOS MAPS, dual mass flywheel, differential, strut brace, and new wheels and tires. The OEM air filters are re-routed to down behind the front air ducts with Dinan’s carbon fiber piping because of the proximity to the engine. Dinan and his team found that at 90 mph, the big V8 was starved of air, so the use of the new air intake system eliminates that effect. Each of the eight individual throttle bodies were replaced with shorter, greater diameter bodies to withstand higher engine speeds. With the extra amount of air, the double VANOS is remapped through the electronic control unit. The factory headers are replaced with more free flowing ceramic-coated stainless steel headers, which give the E39’s V8 28 more bhp than stock alone. To replace the rest of the heavy factory exhaust, Dinan connects the ceramic-coated headers with a more free flowing true dual exhaust. To take full advantage of the newly freed up power, Dinan changes the differential with a shorter ratio 3:45:1 limited slip. The final additions are an alloy strut brace and Dinan’s signature 18-inch forged wheels with Michelin’s Pilot Sport 2’s. The finished M5 weighs in at a hefty 3965 pounds.
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