I need to replace my stock muffler on my 6gc because I discover a hole . I seen the one I want to get APEX'i N1 Metal Universal MufflerAPEX'i USA. My engine is a 5S-FE. What is the stock exhaust piping diameter? Is it 60mm or 75 mm?

This post has been edited by MauiBuilt: Apr 14, 2007 - 2:36 PM

On a 5S-FE I wouldn't go any larger than 2 1/4" exhaust. As a comparison, my 3S-GTE runs a 3" exhaust all the way through.

So I would recommend you the 60mm exhaust.


Also be wary that you will need earplugs for the N1 exhaust it's loud.

This post has been edited by tangcla: Apr 14, 2007 - 7:10 PM

I think the factory exhaust pipe size was 2", so ideally 2 1/4" and 2.5" should be fine. As far as the Apexi N1 muffler goes, it will be loud unless you install a resonator muffler between the cat. converter and the rear muffler. It will help deaden the sound on a custom catback setup. My exhaust setup is 2.5" pipe size with magnaflow high-flow cat. converter, resonator muffler, and Megan Racing N1 muffler. So the tone of my car should sound close to what yours will sound if you got a custom setup with the Apexi muffler.