2015 Subaru Impreza 2.0i

Sell it and start over with a proper WRX. Seriously!

The FB20 motor can not handle large amounts of power on the CVT transmission. If you have a manual then look into pro-chargers and a new ecu with Dyno tuning. The other way to go is to shave off weight, add carbon fiber, and delete all extra weight. Now to gain any type of power also look into exhaust and intake upgrades as well as fuel system. Don't let the jerks who buy their cars and don't build them from base up talk smack. I built a lancer ground up and got 440 ilbs of trq from a FWD SOHC 2.0L; meaning it is always possible. Best of luck.

Oh boy. We see the failed carcasses from WRX wannabees at the wholesale auctions all the time. Cracked, faded carbon panels, hanging goofy exhausts and honky CAIs, skipping or missing and barely limping along. Again, just buy a proper rex and proceed carefully. Too many young turks have been there...only a few have no regrets.

So if you admit that few have no regrets then why not give him the chance? This isn't the 90s anymore, you can find everything you need via online and tuning has come a long way.

Because it's a narrow road to success, Chas. I properly built up an MX5 NC w/ a Cosworth SC, full suspension, exhaust, two cooling systems, etc., and enjoy it as a daily driver...but only after 5 careful tunes (and still need one more to accommodate the new long-pipe header!). Following the successful iterations championed by a couple of careful suppliers makes great sense, but in Subaru's case the factory has done SO MUCH work that it's silly to try to reinvent the wheel. Yet the factory's disasters around the early 2.5T GTs still litter the landscape. But now I'm wondering if there IS a reputable tuner who can squeeze more from the FB2.5 ('13+ Legacy) without scraping up the CVT's bearings?

Thomas: stick or CVT? If the former, be careful. If CVT don't bother.

If nothing else save the money and headaches by buying a proper WRX. A heavily modded Impreza will have almost no resale value after you have sunk 10 grand into it.

F_O_R is absolutely correct here. You really want to KEEP IT for a decade's use. Same with my SC'd '06 Miat GT. After +$11k in proven mods I'll be lucky to get a third of that back upon resale.

True Ernie but try and get a decade of use out of a hot rodded Impreza modified by someone that has no idea what they are doing. 10 months maybe........................

This here is the reason I left the tuner community 90% of the "community" is self absorbed know it alls who have been there done that and if it's not what they own it's junk lol I am a Subaru tech and I'll be the first to say every wrx ever is junk unreliable cheesy turbo setups and owned by complete tool bags anyway your impreza is a nice reliable car the mod support for it is not huge power major power gains will be pricey so start with suspension wheels tires and appearance also a nice exhaust for sound then save your pennies buy a supercharger and get it properly tuned and if it is a cvt it will hold up

No kidding.

Well if you got the money to buy all the high-end stuff and everybody has an opinion. We’re going with a CVI Units you can’t go wrong. It’s not as powerful as a turbo vehicle but it is a lot less than cost and you will be pleased with the performance you do get it. We’ve done a lot of non turbo Subarus and everyone has been very pleased with the cost . Inertiatx.com

Ignition coil voltage is optimized for spark plug gap already. Increasing that voltage can only stress the plugs' anodes (so at least using iridiums may be ok). I'd want to see carefully performed comparison data to reduce skepticism. If you want to send me a unit for 2015+ 2.5i DOHC NA Subarus I'll perform such a test very carefully, perhaps on several specimens in my menagerie. Best, Ern TSG/B