95 kPa at WOT, exhaust too small?
I recently swapped from a mild 5.3 to a LFA, basically converted to LS2 specs like a 2005 GTO and running off a 411 PCM.
It has a Summit 8706 cam with recommended springs, flat top pistons, 243 heads, NBSS/TBSS intake, 92mm TB.
The truck has always had a Summit exhaust kit, it's 2 1/2" from shorty headers all the way out to the bumper. It has a dual in dual out muffler.
When I start the scanner the manifold pressure reads 101 kPa as usual, but at WOT it'll raise(?) to 95 kPa.
Is there anything else that would cause this other than the exhaust being too small?
Can't attach scan for some reason.