M104-AMG

iTrader: (8)

I'd like to run either an electric or manual exhaust cut-out that would bypass my Trust cat-back muffler.

I am running a resonated mid-pipe.

Any issues other than having my PFC re-tuned for it ?

I already have a low (10-psi) and high (14-psi) map on the PFC from Steve Kan.

Would it be better to have a RPM "trigger" that OPENS the cut-out above 4500 RPM and have both maps tuned for it, OR just manually OPEN when I select the high boost map ?

BTW: I had a slight exhaust leak while on the track, and she felt so much better "un-corked" at the cat-back muffler.

:-) neil

M104-AMG

iTrader: (8)

Here are some links for electric exhaust cut-outs:

http://www.buickgn.com/electricexhaustcutout.htm
http://www.quicktimeperformance.com/QTEC/index.php
http://store.summitracing.com/partde...5&autoview=sku

:-) neil

darkside7

iTrader: (12)

why would you need a cut out if you already have a full exhust?????

Mahjik

iTrader: (1)

What he's saying is that typically those cutout go before a catalytic converter. So you can flip a switch and bypass the cat for the track days. If you have already removed your catalytic converter, the cutout won't give you much at that point.

darkside7

iTrader: (12)

Thats my point. He has a resonated midpipe.

Mahjik

iTrader: (1)

That was directed to the original poster to explain your comment. I forgot to preface my post with the original posters name.

M104-AMG

iTrader: (8)

Mahjik,

I have a Trust SP cat-back muffler, which I have been told is very restrictive. Is this true ?

Hence, when I had the exhaust leak between the resonated mid-pipe (Magnaflow muffler) and the Trust SP cat-back, the engine spun easier and the acceleration under boost was much better.

:-) neil

Mahjik

iTrader: (1)

I think that was a placebo. The Greddy/Trust SP is one of the better flowing (and sounding) catback available. Your Magnaflow muffler would probably be more of a restriction that your cat-back.

There are some exhaust which are fairly restrictive (old style HKS Dragger, Racing Beat, etc) but IMO its not worth the hassle of the cut-outs. As already mentioned, they are really designed for by-passing converters.

AnthonyNYC

iTrader: (3)

I have that cat back and made over 570HP with it. I also had it with a racing beat 3inch presilencer and made over 550HP with that setup.

Anthony

M104-AMG

iTrader: (8)

Wow, I didn't now the Trust SP was that good.

Perhaps I should replace my Magnaflow mid-muffler.

Any recommendations ?

TIA,
:-) neil

M104-AMG

iTrader: (8)

I have read that a quieter car will seem slower and a louder car will seem faster, all things being equal.

:-) neil