Quote:
Originally Posted by ULTRAZLS1
FWIW Im not sure I like the sound of my catless headers into my stock NPP. Kinda raspy/tinny. On a cold start with valves open it makes a terrible high pitched raspy noise for about 5 seconds before idling down as well. I been keeping the car in tour mode sounds the best now IMO.
Ill probably end up getting the kooks full exhaust in the future.
So as far as sound...with a stock npp catted would be better. You made the right choice. And as others have said the hp difference is less than 5hp when using hi flow cats
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I have noticed this too. I am going to look into options that might help with the tinny sound. Maybe some bullets inline or something.