Mufflers or Cat Back?

start with the mid pipe first.. it will free up more... !!!

O/R pipe or catted mid pipe first, then if still not loud enough get some weld ins.

JimmyS5600 said:

Guys I like the thought of the mid pipe. Makes sense to me. I just looked at a few and the cat. converter equipped ones are sure pricey.
If I go the non cat mid pipe do the mil eliminators work?

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They work sometimes. The only SURE way to make sure you don't get a CEL is to get a tuner.

Buy good, high quality MILs and you wont have a problem. Another option is Diablo Predator or SCT Livewire, Xcal or similiar hand held tuner. This will also correct your speedo when you get gears - and you gotta get gears (hands down the best mod for seat of the pants - totally changes the car)
Honestly, I'd start from the rear of the exhaust and work forward...the best option (which is what I finally did for both GTs last year) is to buy and install both a midpipe and catback at the same time.

Steeda has MIL's and they will work on your 99. I have sold many sets when I worked at a mustang shop, and never had any come back defective. www.brenspeed.com will cut you a deal if you buy a mid pipe and mil eliminators together. I have an off road H pipe and a flowmaster weld in mufflers, and love the sound.

weld in some flowmasters...mufflers/labor was $180, much cheaper than spending money on a catback.
get a midpipe with the left over money!