Okay I have two questions that need to be answered. First off i am ordering the magnaflow high flow cat from ebay, I have a TBI and some members have told me that I need a 2.25" for it can anybody confirm this for me? And second I have been looking at some glasspacks, do they replace the factory exaust, or what and where do they weld on to?

 

If you have the stock manifolds and y-pipe then your cat is 2.25". However, if you're taking the car to a muffler shop to install you can get a bigger 2.5" or 3" cat that will make a big difference in horsepower, and give you room to grow later when you add headers and a better exhaust and muffler.

Glasspacks are for lowriders, not sports cars. Stick with regular mufflers made for thirdgens.