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Shorty headers with the Solo HI flow cats are the only way you will get a power increase. The stock cats are the major restriction point. If your an l99 get the Ls3 Solo hi flows the L99 have a connection to absorb vibration when the dod is active and they leak. The Ls3 is solid stainless body. The Jbas with the Solo hi flows don't need a tune...but on cars newer then 2011 I believe they tripped a cell and then you need extenders.
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