Tuning for open exhaust?

[djj624]

Hi all. Im thinking of of running a new downpipe to an electric cutout/dump and keeping my factory exhaust system to keep things quite on the street. This way ill have a free flowing system when i race and original sound and looks.
My question is will i have to retune for when the dump is open being im running through factory exhaust?

 

[NVRL8]

Some guys get an increase of a couple lbs boost by running with an open exhaust (especially if the exhaust sytem is restrictive). You may have to tune for this increase in boost.

 

[Roc87]

Since you have PAC alky, if it goes up some in boost you should be alright, just watch the KR. With the hooker exhaust vs. open dump pipe, I only get around 1# and just a little leaner 10.8:1 vs 10.4:1 with it closed.

 

[LOLGN]

I run the same setup, an electric dump on the stock exhaust. I don't even bother going wot with the dump closed cause it's such a big difference between the two. When I start doing some fine tuning this year it'll be with the dump open.

 

[MSDGN]

I've found absolutely no difference in performance on my car between opening and closing the dump...I like it better closed...car is quiet and stealthy...plus I can't hear squat with the dump open...

 

[forcedfedv6]

2 pnds more here with open exhaust, just becareful when you tune..

 

[djj624]

Wow most people iv talked to and posts iv read claim that they have gained in the quarter mile with et and mph.