i run an off road H pipe with no cats and i like it, but i have never tried the pro chamber... mustangs unlimited.com has the mac pro chambers (no cats) for $229 and the mac off road h pipe(no cats) for $169 and thats for 96-98 do you have headers?
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under drive pulleys, K&N air filter,
BBK 62mm TB, BBK fuel pressure gage, BBK inline fuel pump,adj. mallory fuel pressure reg., full length headers,flowmasters,off road H pipe, subframe conectors, PRO 5.0 power tower, 4.10's, accell coil packs, thundervolt 50 plug wires, and catapult trailing arms........
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