NEW EXHAUST

[lincoln361]

So I got my car tuned and dyno with the TVS 2300 , slp loudmouth 1 with no cats. After 2 weeks of driving like that, I could not bare the noise and rattle anymore. So I installed the slp 2 exhaust. I noticed now that when I had the slp 1 that it would read -20 to -4 when I will be cruising, now with the new exhaust I stay around 0 thru 3 on the boost psi gauge.I am guessing since it has some back pressure now. Am I going to have to get it retuned? or is this normal? Just want to be on the safe side.

[K32 Camaro]

From what I have read there is no back pressure difference between exhaust systems on this car. Perhaps a sensor malfunction. I'd call your tuner on this one..

What rattle are you talking about??

[UNRIVALED SS]

There is always some back pressure. When running a supercharger if you make intake or exhaust changes i.e. ported throttle body, adding headers or in your case changing axel back muffler sections. Unless its an identical component it will affect airflow and thus affect your fuel/air ratio. I would put it on a wideband A/F guage and log it to be sure but if the boost guage changed. There's a reason it changed. Remember more restriction will show more boost, to a point .

[old motorhead]

If you're showing ANY boost at cruise (unless you're climbing a hill), something is wrong.

[Kronix]

I have the TVS2300 & SLP LM II and my boost gauge reads what yours was reading before you made the switch, which are normal numbers. Your numbers should remain the same from the Loudmouth to the Loudmouth II, I'd call your tuner.