Is there a noticeable loss in HP or spool? also is it alot quieter?

 

I saw a dyno plot between stock cat / no cat / and hi-flow cat. This car made 260whp on no cat. with stock cat it obviously sucked, but the hi flow only lost 8whp and no significant spool loss either. Don't ask me to bring up this thread where I saw this cause it wasn't on HT so i doubt I'll find it again...lol. Quietness I wouldn't know, but many people just get no cat because it's cheaper and offers slightly better performance.

 

I'm going to be going from test pipe to stock cat, then high-flow cat when it gets here.

 

I did, the car went pig rich and spooled slow as hell. This was from an open 3" down pipe with just a bullet style muffler to the same setup but adding a Carsound 3" cat between the down pipe and the muffler..

 

saw a evo this past weekend go from 306whp with a cat to 450whp with a test pipe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sleeping@theline &raquo;</TD></TR><TR><TD CLASS="quote">saw a evo this past weekend go from 306whp with a cat to 450whp with a test pipe </TD></TR></TABLE>
i wanna see that, thats ******* sick

to comment on the oem to high-flow it honestly made a difference on my car, before the high-flow cat it would never break the tires loose up top and now with it on there it seriously makes the turbo spool a little faster and it breaks the tires loose at about 6,500rpm, and this is on a b16+GReddy 18g, i was happy