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Discussion Starter · #1 ·
Changed the rear section of my exhaust last week. I had a full dual custom before, but the rear had crush bend pipes. The new rear section is Stainless Steel Mandrel Bends and I now have two inlets into the stock mufflers. Have a look and listen.

http://youtu.be/stqr-gE06TM

Lou
 

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That sounds awesome!
 

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Discussion Starter · #5 · (Edited)
Ran new Dynos last week with my new rear and modified mufflers. The results are almost a year apart, so really can't compare, but a good baseline in my mind.

Blue - Stock Exhaust Manifolds and Cats, Modified custom dual exhaust with glass pack resonators, X pipe and stock mufflers, Takeda Intake

Red - As above with PPE Headers and Magnaflow HiFlow Cats

Green - As above with new mandrel bent rear section and dual inlets into stock mufflers

I'm happy with the results, although I was looking for at least 390HP:( Looks like the improvements come mostly at the top end.

I brought a friend up with me who also has an '08 F. He has PPE headers, no cats, a JoeZ exhaust and an Injen Intake. He had a run of 399+HP with smoothing set to 5. His other two runs were less spectacular because he was running lean and the electronics were retarding his timing.

Edit: To add new Graph for Friend's car compared to mine. He seems to be breathing better at the top end, above 5500 RPM.

Lou
 

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Discussion Starter · #7 ·
^^^^Not quite, the only stock parts left in my exhaust system is the mufflers, and those are modified. Everything from the headers on back is non stock.

Lou
 

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Sounds great...subdued but still mean.
 
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