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Finally did some performance upgrades to my '09 Mustang last year. I bought her new in '09 and have just over 23,000 miles. Over the summer had Eibach Pro-System Plus suspension, BMR rear adjustable pan head bar, GT500 style strut mount upgrade, BBK long tube headers and high flow cat X pipe. I already had Corsa cat back exhaust and with the long tube headers and high flow cats the sound increased quite a bit at WOT. Not to bad on the sound with mild throttle input, but it is loud when you get on the throttle.
Last fall I took her to Brenspeed for an Edelbrock stage 1 upgrade including Comp cams and a larger aluminum radiator. The expert dyno tune put out 500 rwhp and about 450 lbs torque. Thanks Brenspeed for the fantastic job.
Just goes to show there's nothing like a custom dyno tune
I second that, I took my car to Brenspeed last November and had a Paxton Throwback installed. Here's my dyno run. Too many mods to list but it has BBK LTH and hi flow cats with Pype Bombs. FRPP intake and throttle body.