im gonna be installing a roush supercharger on my car and im thinking of adding a high flow cat xpipe. will i need tune for this. ill be using the factory roush tune. also how does the high flow cat system sound compared to the o/r pipes. i had the o/r pipe but it sounded a little to ricey for my during accleration. will the high flow cat system be relatively quiet like stock cause i would like to hear the whine of the supercharger also.
p51 chargers are on their way, you can also get the forged internals added to the sale. im patiently waiting...i think no matter what your pipes sound like the whine will be apparent
High-flow cats change the sound a little bit. It added a little bit more low rumble to mine and the cats were the only thing I changed. I went from a Bassani X-pipe with regular cats to high-flows because one of my cat's insides (no Jazzer...not one of my pet cats' ) were starting to rattle.
well from whhat i gather your gonna want forged internals with aything over 475 or 500 hp, or ya may blow it. roush is basically offering to let you keep your warranty as long as you get forged internals, heres a snipit from stage 3 motorsports \
quote:
As most of you know Roush is using a larger 2.3L supercharger on the 2008 P51 cars. The P51 cars are using all forged internals in a stock block(4.6L). The short block will be sold retail in the next couple months (approx. 4500.00 retail). These short blocks do require that you take the heads off you stock motor.
Soon we will be selling the P51 supercharger in a kit for your 4.6L (hopefully 5800.00 range). We are looking at making 500 flywheel HP with the stock bottom end. If you are willling to spring for the forged bottom end we may be able to offer a full warranty on the powertrain. This blower will run much cooler than the current 1.6L supercharger. The 2.3L supercharger lends itself to upgrades better than the current supercharger. This new supercharger will have a cold air kit, and the ability to run a GT500 throttle body.
Sounds like for 10K you can have a forged motor, 2.3L blower, and all the HP you can put through your stock trans.
Printable Version
roush supercharger and high flow cats - 
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) were starting to rattle.
