Jim.c Posted May 11, 2016 Share Posted May 11, 2016 What is the best exhaust diameter for a 4efe for performance Quote Link to post Share on other sites
aarzlp Posted May 11, 2016 Share Posted May 11, 2016 Our lass has a 3.5 tip going to a 1.75 and thats what most people use I thinke this is some help Quote Link to post Share on other sites
Jim.c Posted May 12, 2016 Author Share Posted May 12, 2016 Yeah that helps cheers. Was it just a universal back box on a coustom pipe or just the standard pipe Quote Link to post Share on other sites
richardc9052 Posted May 12, 2016 Share Posted May 12, 2016 If you're talking about from the manifold back then 2" is bang on. Mid section being straight through to a back box. Any smaller and you lose top end, and bigger and you lose bottom end. Also adding any extra silencers or a cat takes away from overall power. This is info I gained from the road dyno in a det3 (power curve data based on acceleration in a set gear) not overly accurate but noticeable changes where made and I could feel the difference with buy butt dyno lolTested 1.75, 2.0, 2.0 with mid box, 2.5, 2.5 with mid box. All stainless from a 4-2-1 20v 4age Mani customised to fit a 4efe. ECU was modified to allow rpm increase (6800-6900 before valve float) as I was not running the det3 in FIT mode at the time Quote Link to post Share on other sites
Jim.c Posted May 12, 2016 Author Share Posted May 12, 2016 Thanks Richard that is very helpful. I have got a early Corolla 4-2-1 manifold to put on. Did you make the exhaust yourself or have it made. Think I will go for 2 inch in that case then thanks Quote Link to post Share on other sites
richardc9052 Posted May 12, 2016 Share Posted May 12, 2016 I made them myself and sold the other 2 when I found the one I wanted to keep lol Bear in mind now the 2" straight through is loud when you use the throttle. I would advise a throttle type silencer if you have neighbours that already hate you or police that don't like loud cars lol. I didn't bother but I live in the country side Quote Link to post Share on other sites
wickedep Posted May 13, 2016 Share Posted May 13, 2016 2" is best.... Quote Link to post Share on other sites
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