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Message: <blockquote data-quote="shovel" data-source="post: 1588406" data-attributes="member: 29855">For anyone whose local regulations allow it a modern ECU is the only way to go anymore.  The old wires aren't getting any fresher and I think it's likely that even on a 100% stock engine just simply by having a wideband (or two) running closed loop along with modern processor speeds and fuel/spark etc control it's going to run cleaner and better than it ever did stock.  Might even pick up 5 or 6 horsepower purely from tighter fuel control on the self-tune and closed loop.   Another benefit can be if your engine is MAF based and your aftermarket ECU is speed density you can take the MAF out of the intake tract.. maybe another pony or three right there. I have nuanced thoughts on emissions equipment but those are not really relevant to this conversation.  One thing that's nice about the standalone ECU's that run MPFI is usually they have enough I/O that you can choose to run some or all of the originally equipped parts.   I was running EGR and evap with the PimpX.   Those aren't (directly) controllable with the Holley Sniper 2 because these TBI systems are deliberately simplified for a clean and easy install, in particular on cars that originally were built with a carburetor. EGR plumbing isn't possible on my application because the manifold doesn't really support it even if I set up the electronic logic.  For evap there's trick I used to make that work so the car doesn't stink up the garage like an old lawn mower.. I might make a video about that later to share with anyone modifying their car who prefers to keep it odorless for their own comfort or their passengers.  Probably not a lot of people "downgrading" from MPFI to TBI - that has other benefits outlined in the very first post of this thread.</blockquote>