I have a SP57 \ 3" turboback \ 5spd swap \ mapECU \ stock everything else.
Would it benefit me much to go get a proper tune ? It was dyno tuned after the single install, but the idle is poor (revs up and down), and runs like 11afr at cruising speeds (seems rich)
Would it be better to go get a good tune or am I not really missing that much and could spend the $ elsewhere ?