Jakub k Posted July 6, 2016 Share Posted July 6, 2016 I've got a starlet ep91 na and I would like to keep the standard exhaust manifold and the whole exhaust system standard but I would like to change the back box to something with a larger exit, 2.5" perhaps, what diameter is the exhaust system on a na and what inlet would I need to the back box? Hope it makes sense 😂 Quote Link to post Share on other sites
SpikeyJp_68 Posted July 6, 2016 Share Posted July 6, 2016 It's around 1.75" I beleive. I've a universal backbox here I had on mine. No longer needed as I'm going turbo Quote Link to post Share on other sites
Jakub k Posted July 6, 2016 Author Share Posted July 6, 2016 Any pictures? Quote Link to post Share on other sites
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