Mopar "recommends" a 2 1/2" exhaust with the Stage 1 kit and was saying it was required with the ill fated Stage 2 kit that will never see the light of day for the PT. So the 2 1/4" is good for something like 250 hp. From 250-300 a 2 1/2" is needed. Above 300 you should probably be looking at 3".
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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