ISF Cat and Resonator delete... Questions

7691 Views 4 Replies 2 Participants Last post by AHI, Jan 27, 2011

AHI

Discussion Starter · Jan 12, 2011

Last night I took out the secondary cats, and the little muffler/resonator that was after it, and welded in some nice piping... I honestly thought the car would sound much different, but it really doesnt...

Do I have to bypass the rear mufflers too to get some real noise? Should I worry about back pressure, or lack of it? I'm a turbo guy, and this is my first N/A car... so not quite sure what the rules are as far as back pressure.

Thanks !!!

Save

1 - 5 of 5 Posts

F'n around

· #2 · Jan 12, 2011

I remember reading a thread on here that someone did a delete on the mufflers and rear cats. I can't remember if they did any dyno testing though after. I'll try to search a bit later when I get some time and I'll post if i find it.

Save

F'n around

· #3 · Jan 12, 2011

here is a recent thread I found on a quick search.

http://www.lexusfforum.com/forums/showthread.php?t=3361&highlight=muffler

Save

F'n around

· #4 · Jan 12, 2011

here is another.

http://www.lexusfforum.com/forums/showthread.php?t=3180&highlight=muffler

Do a quick search for "muffler" and you will find a few topics on the discussion.

Good luck.

Save

AHI

Discussion Starter · #5 · Jan 27, 2011

I removed secondary cats, mid muffler, and two rear mufflers, and installed a straight pipe.... WAY too loud. Put the factory mid muffler back on, and it is much better, but there is a little drone at 2,000 rpms and 3,000 rpms.

Save

1 - 5 of 5 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month