I've been looking for an used exhaust system, around 600-700, in the wanted section for months. The only probable one I came across was already sold. So, I am giving up on my exhaust idea.

I am now thinking of just getting some cats and saving some money. Maybe RT, Crawford, Kinetix, etc. I was wondering if adding cats will make a noticeable difference in the stock exhaust sound? Will I get an equal amount of gain from that cats as I would an exhaust? Which are the best, by best I mean least problems, solid, reliable and fairly priced?

Thanks guys.

 

http://www.crawfordzperformance.com/highflowcats.htm
The sound will be louder, not too bad.

 

I have the Crawfords and the only problem I had was the left cats heatshield would rattle against the frame when the engine was under heavy torque (mid RPMs). All I had to do was bend the heat shield a little (less than a centimeter) and all was well.

It increased the volume of my Fuji a few dB. It sounds great.

I haven't had a chance to check actual performance numbers yet, I'm going to dyno and drag it next week.

 

Hey

I would go with Crawford for certain..

However, you need to modify the sheet metal around the cat to create additional/needed clearance..

Gurgen

 

I have the crawford cats and love them. Although I feel the difference I can't really tell how loud they are vs. the stock.

 

Just understand you are personally liable for the cats and if you replace [with non oem]then you can be made to reinstall brand new oem cats by subsequent owners of the car in the future if they find out by failing a dyno type emission test. When you sell a car you are certifying it is emission compliant.......the one case where buyer beware is not applicable. Even though it passes at the transfer any emission mod holds you liable for the future at least to 100,000 miles. [states vary].

The higher flow cats don't last as long.

 

What is your opinion on the Helix 200’s? They cost about $445.00 or the Random Technology cats at $640.00. With the exception of the Crawford's and the exorbitant cost of the Nismo cats, these appear to be the only other options.

 

What's the difference between Crawford and Nismo cats? I think there must be a reason for the huge price difference. I have heard Nismos are not ceramic, is that true?

 

How long are they expected to last?

 

How do you modify the heatsheild to prevent rattling? Can someone post a pic?

 

i read on this forum that with the rts you get the guts comming out the back of your exhaust. not happy with the sound that my helix test pipes are making so i myself am looking into some new cats.

 

Here's a quote from Autonet.ca:

 

what does "an engine that runs rich" means?

 

Too much gas, not enough air.

 

Resonated test pipes.