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My car has Trust 3 inch cat back exhaust. And I just install the one piece dump/front pipe. But still with the standard cat...

I read some post about with full exhaust and the boost will increase a bit. But, mine doesn't increase at all... Still sitting at a bit under 0.5bar. Just same as with only the cat back exhaust.

This is without any boost control. Anyone know why? Mine is a R33. Is the boost increase only for R32?

:shake:

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https://www.sau.com.au/forums/topic/20059-dumpfront-pipe-and-boost-increase/
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With no boost control, and a 3"cat and cat back, my R33 made 7psi up until about 5000rpm, then went to 9 psi, with front dump pipe it definately spooled earlier, but the actual boost increase was very minor, too hard for me to tell acurately on an autometer boost guage. I think it was a bit higher, but cannot say with certainty.

Get rid of that stock cat, it will be hurting you. If you have a restriction anywhere on the exhaust side, it will rob you of power.

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