hey all, i'm still new to how boost and stuff works. I think I have an issue but i honestly don't know. recently I installed a vibrant header/dp. Prior to that I had on Injen CAI and GMPP Catback. Before installing the header/dp I was getting about 12-13 lbs WOT and now after installing the header/dp I am only getting 10 WOT. I understand how superchargers work with backpressure and all but according to the place where i bought the header/dp from it said i should have gained boost not lost it. my theory is that since its larger piping its less backpressure thus causing less boost, but i have no idea. thats why im asking. how much boost should i have WOT with a header/dp, gmpp catback and an injen cai? do I just need a tune, or what lol. oh, and I checked for leaks already and couldnt find any or hear any. thanks in advance.

 

I did a zzp header and 3" catless dp and gmpp exhaust I see about the
same it's because of less back pressure in the motor because theirs less restriction in the exhaust system you won't see more boost unless you do a smaller pulley

 

less restriction means lees boost. boost is restriction that's all it is really

 

so then its not necessarily a bad thing that i lost boost? I guess the website i bought it from threw me off saying i should have gained boost which to me says you're gaining power. thanks for the quick reply.

 

More boost doesn't mean more HP. You reduced restriction in the exhaust allowing it to flow easier.

 

gotcha. thanks all.

 

The the best thing to look at to check how your engine's flowing is the MAF readings. That probably went up a little bit (whereas boost won't for the above stated reasons).