Well unless you get a 2.5 h-pipe, you wont get anything noticeable but sound with the mufflers, go to www.mustangexhaust.com
A 2-1/2 catback might give you a few hp, but if you can do headers, h-pipe, and catback you will really feel a difference, i do know when i put my 2-1/2 tailpipes on my (flowmasters that were already on the car), made a slight difference in sound and performance, more than the stock 2-1/4 pipes.
btw, do you like the humm of turbo mufflers? or the deep drone of mufflers like flow's, or spintech? go to the site.
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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