x2 or high flow catalytic converters up front. Magnaflow and others make universal performance cats that won't take away power. They will help control the noise though. Good luck!
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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