We’ve got the Parts Shop Max oval exhaust on the Restomod S13 and it sounds awesome! The fitment is great and utilizes factory mounting locations for a perfect installation. This is the stainless-steel version. The exhaust system is a turbo-back, so it includes an oval downpipe as-well.

Here’s a video of how it sounds. The restomod S13 is powered by a stock S13 SR20DET. Stock internals, stock cams, stock turbo, etc. Everything is factory other than a few bolt-ons, like the ISR Performance front-mount intercooler.