racer02GTstang

well. that makes sense then. lol

97targa

High flow cats on a street car will net you roughly 2-3hp loss virtually unnoticeable!!! No cats is very smelly and has anyone eveer seen the new movie out with Al Gore...Inconvinient Truth??? Everyone thinks..ahhh I can't make a diff., but infact if everyone on this site used cats then we could all make a diff.! High flow cats aren't even legal although they trick the sensors!

2000GT4.6

There is no signficant difference between a aftermarket midpipe with or without cats.

You can pick up significant horsepower going from the stock pipe to a o/r pipe, but comparing a aftermarket o/r to a catted pipe you are not going to see signficant results. The high flow aftermarket cats do not make that much of a restriction difference.

The only negitive side to going with the catted pipe is the price and a difference in how it sounds.

GTowner4life

Dont get O/R anything with a roush exhaust unless you want to die of lung cancer.

96_LAstang

I love having an o/r x because of sound, but the smell sometimes is very annoying at times when the wind is blowing back towards the car.But overall i would go catless

cahtr6

Obviously some of you guys were not around the days before cars had cats. You get used to the smell of raw unburnt gas from your exhaust.