[W126 Coupe] Help on Exhaust modification

[Divov]

As the first step looking for more power I plan to modify the standard exhaust system for racing.
I don't care about noise levels so I thought of simply cutting out the 2 front transversely mounted silencers on my 500SEC and just leave only the rear silencer. Has anyone got some experience on this? 
Remember we already don't have all the emission control crapola on our cars.
If I don't plan to change the exhaust manifolds is there any point in going bigger diameter pipes?
Alec Divov
84 500SEC Euro
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