Retune?

[jough]

I have a BB Traditional Tune. I had an '04 Tahoe with 5.3 Flex fuel. I now have an '05 LQ9, but it has the 5.3 y-pipe & freer flowing muffler. The tune was done after the LQ9 & Airraid MIT install. Today I found a set of 6.0 cats that enter the muffler separately. If I go with the 6.0 cats and a Magnaflow 15734 cat-back system with a 3.5" pipe after the muffler (stock is 3"), will I need a tune adjustment?

EDIT: Ordered Magnaflow 15734

 

[Rd05lly]

Yes and No you might pick up a few horses. But if it is a LQ9 tune with same crossover no.

Was it wideband tuned

 

[JennaBear]

No changes needed for the exhaust.

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