ironexecutioner

Hi, I have a 98 WS-6. Only mod is SLP catback. I would like to punch out my cats since I intend to put on headers and an o/r y pipe soon enough anyways. If I do so, 1st.. will my car sound like ***? 2nd. will i throw a ses light if i get O2 Sims? Help please!!

conan

iTrader: (5)

Wait untill you get headers, You wont see any gains from punching out the cats. You will need o2 sims of have the rear o2's tuned out when you get headers.

ironexecutioner

well, when i get the headers i will be purchasing an hp tuner so i will just tune it accordingly. i had a 97 cobra before and when i punched the cats i noticed some gains, not heavy ones by any stretch but a little. ur teling me I wont get nething???

ls1_doc

iTrader: (6)

honestly u wont get much ... there are only 2 converters and they flow fairly well for stock cats. Mustangs have 6 cats and the bigger ones down further are very restrictive so u do notice pretty good gains on those cars.

ironexecutioner

well if i do it, will the o2simms keep me from running in "open loop mode" with the ses light on?

ls1_doc

iTrader: (6)

yeah that should do the trick .... o and some people say it gives it a raspy hollow sound ... but depending on which slp catback it is it should still be mellow unless it the lounmouth then it could be pretty nasty.

conan

iTrader: (5)

The small small gain you might see is not worth the time and effort IMHO. Also most time's the cat studs brake giving you more of a headache. Just my $.02

Mikerace15

iTrader: (1)

If you hollow your cats now your just going to be putting alot of effort into something thats going to net you a minimal gain at best. Plus this effort will just be lost anyway when you put the headers on. IMO just leave your cats alone and just wait for the headers.

FBDYLVR

iTrader: (14)

Leave the cats alone and sell them to people who need them. Put a test pipe in place...