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will removing the rear mufflers increase performance?
I mean the ones at the very rear. Also, Is the exhaust on the gs400 similar to ls400?
No, only noise. There 2 resonators, not to be confused with cats, and 3 mufflers. Try unbolting the mufflers at the rear axle and tie them up out of the way of the exhaust, rev the engine a few times and see if it's for you.
What's your definition of similar? Yes, their both V8s, yes they both have y-pipes with dual exhaust. The GS400 and later model LSs got a higher, I believe 10.4:1, which increased the power, as well as the introduction of VVT-i.
No, only noise. There 2 resonators, not to be confused with cats, and 3 mufflers. Try unbolting the mufflers at the rear axle and tie them up out of the way of the exhaust, rev the engine a few times and see if it's for you. Good luck.
Are there not 3 Cats, 2 Resonators, and 2 Mufflers..?
dont do any of the mentioned above. messing with the back pressure of the exhaust will eventually(it will take a while but it will happen) start bending your valves. just get a custom exhaust from a muffler shop. they can tuck it up for you so it can be hidden if you would like.