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Old 07-24-2011, 04:59 PM   #3
brantley847
v It bites.
 
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Drives: 2011 IBM 2SS/RS
Join Date: May 2008
Location: Orlando, FL
Posts: 3,513
Forgive my lack of knowledge for terminology... but are you referring to a muffler delete? If so, adding that amount of volume with headers is mind numbing.... I say go both. Flowmasters or Borla sound incredible with headers.

You will notice the most performance gain from LTs of any mods you have done to this point... as I did as well. Combining the TB, tune, LTs, and ADM will really wake up the L99.

I only voted catback because LTs with off road or muffler deletes make my ears melt.
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2011 2SS/RS
Performance: 439 RWHP: 226/236 Comp Cam, Kooks 1-7/8, CAInc, Borla S type, Vmax TB, Rx Catch Can, Trans cooler, SLP 160 termo, Melling high volume, Eibach Springs/Sways 1" drop, Whiteline complete bushing kit.
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