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(Post Link) post #1 of 3 Old 19-08-12 Thread Starter
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Backboxes for 156 GTA and performance

How much (and is there any) performance gain in the back boxes of the sort of Raggazon and JSC ?

For the Twin Spark 2.0 it was said that replacing the back box could give as much as 10hp.
How is it with the 156 GTA ?

The most restrictive part of the GTA exhaust is said to be the two cats at the manifold, and the main cats, but how is it with the back boxes ??
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I have Raggazon backbox in my 2.5 V-6 but I bought it with car. Also interested how much it can give.
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Free flow boxes will improve response and overall HP a bit, but as said the cats are the more restrictive part in the whole exhaust, taking away minor restrictions after that major restriction will not change overall restriction much...

If the question was the other way around: "How much will the back-box change performance AFTER cats are removed?" Then I would agree that maybe 10hp increase for the GTA, less for the 2.5.
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