what is best size when upgrading exhaust system?
 

I have a 98 eclipse, n/t.

I want to upgrade the headers, cat and catback exhaust but there are a few different intake/output sizes on the market

currently have 2" intake/output

can I upgrade to 3" or would 2.75" or 2.5" be better all the way through (headers/cat back/cat)

also, what is the difference between a cat converter and a test pipe?

leslie

dont go bigger than 2.5" and dont get rid of the cat

Awesome - thanks!

Any reason 2.5" is best?

Can you offer any recommendations on brand or a site that might offer a full exhaust from headers to cat to cat-back?

Do most exhaust systems come separate (buy the header, buy the cat and buy the cat-back exhaust?)

What would be the cons of 3" vs. the 2.5" or 2.75"?

Your help is greatly appreciated

wanting more horsepower,
leslie

the thing is when you start getting larger than 2.5" on a NT car you begin to lose backpressure which is very important on a NT car. And also when you start getting too big on a 4 cyl car you will get a very raspy sounding exhaust.

As far as what type to get...everything typically comes separetly. But alll you need to get is headers and a catback. No need to replace the cat that you already have. I would suggest Apexi or Magnaflow for exhaust as they should both give a decent sound. Here is a good site
http://www.cimotorsports.net/motor-s...back-exhausts/

And i think either of these headers are nice
http://www.cimotorsports.net/motor-sports/headers/

But you can do a search on google or something for other sites that may have them cheaper. Just stay away from no-name brand stuff and ebay

Thank you very much - I can't wait to do a bit more of an educated research into my upgrade:D

I will be sure to ask for more advice, when the time comes:o