Since delivery of my GT, I've been looking for three things - a free flow intake, a freer flowing exhaust and a strut tower brace. So far, no vendor has indicated they have anything for the GT.
I've driven a sequential (2 turbos) turbo'd RX-7 for some 10 years now. While not an expert, do have some experience. As noted, the more air you can flow through the system, the more power you make, and being able to move the hot gasses out of the engine, the better for it. Up to a point. That point is dictated by how much gas flow the ECU will provide. You can get to a point where you have so much air and so little gas, you lean out and grenade the engine.
I'm not familiar at all with this 2.4l engine, so can't comment on where that point might be. However, can't help but believe that opening the intake coupled with a freer flowing cat-back won't approach it. As long as the cats are in, plenty of margin, IMHO.
Jumpin' Joe
Onyx Green GT
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