Review of 1989 Mustang GT
 

Car: 1989 Mustang GT

Part: Mac 1 5/8 unequal shorty headers
Pro's: Not too expensive, Installation is easy if you have the right tools.
Con's: It is hard to tighten the headers down due to the pipes being very close to the bolts. Coating sucks (these were not ceramic coated)

Part: Mac O/R 2.5" H-pipe
Pro's: Solid & Durable, I've bottomed out several times with only a few minor scrape & dents in the pipe. Great sound.
Con's: Hangs low. It probably wouldn't be a good idea to put this on a lowered mustang.

Part: Ford Motorsport X303 Camshaft
Pro's: Fair idle, big torque & hp to 6200rpm. Used & still using OE valve springs
Con's: None found yet.