I used to have an Extreme exhaust on my old 4x4 saph and that was a really nice system apart from the nasty 4" inch slash cut tail pipe as previously mentioned.

I recently bought a Mongoose system from a fellow member on here and when tried to fit it, it just did not fit at all but that was due to running a 6 degree rear beam and a Supra diff. In the end I got a custom system made by Edwards Motorsport. It cost a little bit more (but not that much more) than what you could buy a new Mongoose or similar but it fits perfectly with no knocks and the welds are lovely on it.