Mountune have very high quality parts, but that comes at an increased cost. And their customer service is pretty lacking in my experience. Cobb have great customer service, and still decently high quality parts too. Whoosh is both, and in my opinion, the best out there. Don't worry about stages, cause it doesn't exactly apply to this car very well. My advice would be to get a street spec RMM from whoosh, either a V1 or V3 FMIC from Whoosh, or a Bravo Alpha FMIC if you think you'll be needing a lot of cooling (ie hybrid or big turbo). You're also gonna want an Accessport too where you can download and use free off the shelf tunes from Cobb which you can use in the meantime. I have a 93 and E30 dizzy tune which I love, but there are also other companies that may suit you better depending on what you're looking for. This would be a good start to maximize your power on the stock turbo, about 230hp if you're FBO (and lucky) on E30 with a definite increase in torque. Induction pieces on this car can make a difference but are only really noticeable when they're all added up, which also increases the cost. Your high flow filter should be good enough for the time being. One thing about Mountune which is nice is that they have a rewards program where you earn points when you buy items. Saved over $100 on a short shift kit (which I highly recommend) when combining points and the holiday deal coupon. Besides that would be stiffer engine and trans mounts, and some suspension pieces (like springs,
coilovers, and braces). You can check the used market on Facebook or the forums here to save some cash too. Picked up my Accessport and a mount for about $400. The AP itself is $550 new. Also attached a pic with a loose idea of a stage program from Ron if that helps.
