Anyone know how long the main cat is for a N/A s4 from flange to flange? I'm looking to change my exhaust set up and i want to verify lengths before i start the project. Thanx!

 

I've got 3 of the cats from a TII in the back garage, but as it's snowing once again, here's a diagram:
http://www.car-sound.com/02product/d...irectfit=23688

Looks like 17 1/2"

 

The bolt in replacement is only 2.25 in. To get a larger diameter you will need to get a universal cat.

I have a Magnaflow 2.5 in universal cat. It is 13 in length with an air pipe provision. It will require a little welding to get the air pipe hooked up correctly as it is moved up higher on this cat.

Magnaflow part # 94116

They offer a 16 in length version with air pipe as well.

Magnaflow part # 94016

From the info above, it sounds like both sizes should work.

 

thanx guys