Quote:
Originally Posted by Lienrocs
I've been running my GT4 X for 2 years and almost 20k miles with a catless tune. I think the tunes you're thinking of are for mid sections with the actual x as far up as they can go.
The GT4 does not require anything special from a regular catless tune apart from disabling the rear O2 sensor because there is only one O2 port per side rather than two.
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Hmm... I already have a full decat exhaust with the x-merge in the stock location (under the center bridge bracket). I thought of getting a local exhaust shop to add a H-merge in the forward GT4 location. I'm running a BPM Stage 2 tune, so I reached out to BPM who told me that a forward merge might affect low rpm driveability. But I think they were referring to a forward x-merge like in the BW X-pipe. Now you got me thinking if I should go ahead and try out this GT4 H-merge.
I wonder what gains adding the H-merge would have, if any?