Just letting people know that they should be wary of changing the system on their GT's as a good friend of mine and i are trying to develop both our GT's in many different areas have found that it may reduce power. the system tried on his car very similar to the Herrod in design but NOT the same, duel system to the first resinator then a single 3" to the rear free flow muffler actually lost 14kw at the treads and 40nm torque due to the lack of back pressure.Next will be trying a standard muffler in the centre to give a little back pressure and see what happens on the dyno.
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