WANT TO REPLACE CATALYST CONVERTER TO PERFORMANCE
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From: Poughkeepsie, NY
My Ride: Black 2004 545i
Blue Jeep Commander 4+4 5.7 Hemi( Saddle Brown )
I NEED TO KNOW WHICH EXHAUST IS THE BEST IN PERFOMANCE FOR MY 545, AND WHICH AFTERMARKET CATALYST CONVERTER TO PLACE THE STOCK CAT WITH? AND WHERE CAN I PURCHASE THESE PARTS?
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From: Saskatchewan Canada
My Ride: 2004 530i
premium package/active steering/auto sunshade/tiag/black dakota leather/logic 7
35% tint all around
19' DPE GT7
post some vids once you get this done< I have a feeling that it will be loud 
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From: Davie, FL
Originally Posted by blacktalant' post='845306' date='Apr 12 2009, 10:26 PM
I NEED TO KNOW WHICH EXHAUST IS THE BEST IN PERFOMANCE FOR MY 545, AND WHICH AFTERMARKET CATALYST CONVERTER TO PLACE THE STOCK CAT WITH? AND WHERE CAN I PURCHASE THESE PARTS?
MIGHT HAVE TO LOOK INDEPTH ABOUT REPLACING THE CATALYTIC CONVERTER!
HOPE THIS HELPS
p.s. Caps are annoying, please refrain from using them all the time.
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supersprint makes cats but they are pricey, I believe 1500 or so for the two of them. Not sure why you would want to-you are not going to add any performance and will lose torque. These engines and many engines rely on the backpressure from the cats being so close to the exhaust manifolds for low end torque development. Eliminate this back pressure by free flowing cats and low end torque goes down. Overall peak HP probably will be unchaned but we all know peak HP means nothing. Also will fail emissions.
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Joined: Aug 2007
Posts: 64
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From: Poughkeepsie, NY
My Ride: Black 2004 545i
Blue Jeep Commander 4+4 5.7 Hemi( Saddle Brown )
Originally Posted by 545OH' post='845440' date='Apr 13 2009, 01:08 AM
supersprint makes cats but they are pricey, I believe 1500 or so for the two of them. Not sure why you would want to-you are not going to add any performance and will lose torque. These engines and many engines rely on the backpressure from the cats being so close to the exhaust manifolds for low end torque development. Eliminate this back pressure by free flowing cats and low end torque goes down. Overall peak HP probably will be unchaned but we all know peak HP means nothing. Also will fail emissions.
A FRIEND OF MINE TOOK THE CAR TO BMW AND GET CHECK OUT, BECAUSE IT WAS LOOSING POWER, AND HAD A MALFUNCTION MESSAGE. ONLY TO FINE OUT THAT THE CATALYST GONE BAD. THE OEM CATS AT BMW ARE SO PRICEY. I NEED SOME OTHER ALTERNATIVE. CAN SOME ONE HELP ME WITH SOME ADVISE?
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From: NY
Originally Posted by ShadeZeRO' post='845438' date='Apr 13 2009, 01:05 AM
THE RPI EXHAUST IS THE BEST YOU CAN GET AT THE MOMENT.
MIGHT HAVE TO LOOK INDEPTH ABOUT REPLACING THE CATALYTIC CONVERTER!
HOPE THIS HELPS
p.s. Caps are annoying, please refrain from using them all the time.
MIGHT HAVE TO LOOK INDEPTH ABOUT REPLACING THE CATALYTIC CONVERTER!
HOPE THIS HELPS
p.s. Caps are annoying, please refrain from using them all the time.
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Joined: Jun 2008
Posts: 5,501
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From: Tacoma, WA
Originally Posted by blacktalant' post='845306' date='Apr 12 2009, 07:26 PM
I NEED TO KNOW WHICH EXHAUST IS THE BEST IN PERFOMANCE FOR MY 545, AND WHICH AFTERMARKET CATALYST CONVERTER TO PLACE THE STOCK CAT WITH? AND WHERE CAN I PURCHASE THESE PARTS?
piss off man
either show some forum respect or go elsewhere.
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From: Davie, FL
Originally Posted by DKNewYork' post='846403' date='Apr 13 2009, 10:26 PM
Take the caps off. It's driving me
Guess it worked?
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