I installed today my ATP 3" downpipe with cat, and let me tell you I'm not even thinking about deleting the cat at this moment.
The car above 4000 RPM feels like a completely different car, I ran a 3" tube from the dp all the way to the axle where it connects with a BTG axle-back.
It sounds just like an SRT-4 and it pulls like crazy now, very happy with my newest mod.
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Patriot Blue 5-Spd, Stage I, Mopar BOV, BTG Intake, Custom 3\" Turbo-Back, Spring Mod, BTG Shock Tower Brace, Vogtland Springs, Koni Shocks, Eibach Sway Bars, Azev Type M 18x8.5 wheels, Ventus K104 tires, Projector Bi-Xenon Lights, Rear spoiler, Autometer Gauges, Illuminated sill plates, K&N Oil Filter, Mopar subwoofer. Mexico City. See pics: http://www.sportcarsforum.com/forum/viewtopic.php?t=715
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