Exhaust for Clean Power
02-14-2007, 09:55 AM
#16
Drifting
We sell the 100cpi cats to customers of our X for $299.95, have them installed on several supercharged cars. I will be glad to sell you a set. (even if it's not our X!)
BTW, I haven't really measured the gains on supercharged cars but I had the white 89' auto recently dyno at 545rwhp with 12.5psi and one of our crossovers with cats. The rest of his exhaust is stock with an RMB. I am quite certain that the gains are greater than with an N/A car.
On the other hand, supercharging properly requires overfueling. The cats will certainly help with the smell but you can expect to see a greater amount of visable exhaust. A diesel Powermax? You may have WAYYY to much fuel!
BTW, I haven't really measured the gains on supercharged cars but I had the white 89' auto recently dyno at 545rwhp with 12.5psi and one of our crossovers with cats. The rest of his exhaust is stock with an RMB. I am quite certain that the gains are greater than with an N/A car.
On the other hand, supercharging properly requires overfueling. The cats will certainly help with the smell but you can expect to see a greater amount of visable exhaust. A diesel Powermax? You may have WAYYY to much fuel!
02-14-2007, 12:58 PM
#17
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Did you guys that fitted the x pipe remember to change the plug on the black box that adjusts the electronics for running without cats............. Jim
02-14-2007, 06:02 PM
#20
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Page 24 - 221 of WSM if you have a 87 or 88, Dont actually know what it will tell the LH unit. But i suppose Porsche would not have put it there without reason, or given options for differing setups. Changing to the setup for "without cats "might give it extra fuel or even less fuel, I suppose the thing to do would be to link up to an emission tester, test it, make the change and test again. It does have something to do with the oxygen sensor so it must affect the mixture in some way. Maybe John Speake could fill in the details.