If you are going to do it, use the h-pipe. WIll improve performance over dual straight pipes. You want the exhaust pulses to be equal or you can lose performance.
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99 Mustang 3.8L, C&L mass-air system, GT dual exhust and rear bumper, Maximum Motorsports 4-point K frame brace, full length sub frame connectors and strut tower brace.
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