Join Date: Oct 2012
Location: Clarence, NY- Buffalo suburbs
If the engine is too rich you get crap fuel economy and unless it's ridiculous it won't hurt the engine, too lean and the exhaust temps will be high and lead to burning parts possibly detonation. As I said it's not worth it, you're talking about $500 minimum for very little gains.
2009 Cobalt LS XFE (F23) Victory Red
YYZ V.3 Springs, Koni shocks/struts, Powell XXX rear swaybar, Brembo brake swap, 5 lug conversion, Ion Redline wheels, SS/SC interior swap including power conversion, K&N intake, Trifecta tune, Ark Performance N-II catback, Ark shorty antenna, SS body kit, Powell F23 rotated mount, LNF rear mount, Powell CABs
Soon to come- EFR 6758 turbo kit and make Retro Headlights.