Mach 1 New 03 mach owner

You'll gain about 20-25RWHP with the mods you mentioned, with the tuner giving you the biggest gain of about 12RWHP and TQ. The underdrive pulleys some people say are worthless on the Mach and can damage your engine. Others will say they work fine on their Mach. I have yet to hear anyone have any real world HP gains on them, and I've heard of Hot Rod magazine testing them on a Mach and actually lost HP. If you want your Mach to sound SUPER loud, get an offroad pipe. I've got a catted Bassani and Magnapacks and it's definitely loud enough to be heard afew blocks away. That's enough announcement I'm coming for me. Pick your poison as for a CAI. Their all in the same area as for HP gains. Welcome to the Mach club. I've got a Predator tuner, but if I was to get a tuner now, I'd get the SCT Excal 2. It's the newst one out there.

Don't put underdrive pulleys on it!! They give no power increase and will cause more headaches than you can stand. They have been linked to oil pump failures in the Mach 1 engine, so stay away from them. The alternator comes from the factory with an underdrive pulley, but that's the only one. If this is going to be a DD, I'd also stay away from an O/R mid pipe. Get a high flow catted h or x pipe, and either Bassani, Borla, or SLP cat back, and it will sound badass. Magnaflow and Flowmasters just seem to make it sound like every other Mustang, but that could just be my opinion. You also don't want to get caught up in the nightmare of trying to get all the parts necessary to put a Cobra blower on it! The laundry list of parts is as long as your arm! You'd be better off with a Procharger or a good nitrous setup. I use a Predator, but I think that the current Xcal 2 is probably an overall better unit and seems to have a better network of tuners supporting it. Good choice of colors by the way! Good luck.

My buddy has glasspacks on his Mach1 and is sounds pretty mean.

SLP LM1 catback.....you'll like it

PHP intake spacer. It will give you back the torque you lost by getting the O/R mid pipe. It will not increase your peak numbers, only low to midrange. For a $100, its a great bang for the buck. paul's high performance is the maker.