Simple question;

Do hi flow cats give the same the rasp you get with test pipes?

 

simple answer. no

 

thank you sir

then I need a set of hi flow cats....

 

Yes. But beter.

 

i have metallic hi-flo cats in my z, they have a tinny/tuner type sound
to them.

fast intentions is the brand, i was happy with the performance gain, just
did not like the sound

 

Kinetix HFC's here, they have some rasp in upper RPM's. I honestly thought it was exhaust leak, but Can't find a leak anywhere. Might R&R them with all new gaskets when I do a Catback just to make sure though...cause its slightly irritating. Seems like the hotter the day the less rasp (once the car is fully warmed up).

 

Currently using Stillen HF cats. Gains about 5-12 HP depending on mods on you car. The CATs sound great at load RPMs. None to very little rasps at high RPM's.

Also the check engine light doesn't come on and i dont smell gas when I'm at a stop which you get from test pipes.

 

I have the Stillen HFC on my 07 with Stillen exhaust and Fujita dual intakes...the Check engine light is on as a result of the cats. Will use the plug foul solution from this site to fix but wonder why my light is on if your's is not??

I like the sound...very little rasp and +1 on no gas smell.

Dumb question - have you reflashed or gone to a fuel mgmt system (if there is one for an 07)??

Thanks for any input!