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I give you the "other side" of aklim. Not bashing anyones opinion ever.
OEM is a 3" downpipe to 3 1/2" exhaust. The greatest restriction is the OE muffler. For $75 installed the Walker 21470 you cure 75% of the issues. If I am not mistaken the MBRP has a 3 1/2" Downpipe which gains a little flow but sacarifices a little low end torque. You can easily use the $300 on tunes and an intake etc etc. The best egt drop I have witnessed on a BTM to 4" conversion is about 100 degrees max.This was on a digital gauge setup, 7.3 F250. The owner still wishes he would have spent the $ elsewhere (ie. better tunes).
Good luck either way
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2001 X, 4x4, White, Limited, PSD,. Oil Guard, Stull 6099 Grille, AFE Intake, X Monitor, Sonnax/Tricumulator, Mobil 1 ATF w/Racor tranny filter, PHP Custom Burn Chip, Walker BTM, W Code Frt Springs, Procomp Add-a-Leaf Rear, Rancho 9000XL's w/5406 SS. Pics @ http://community.webshots.com/user/txangler32
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