I'm considering a set of caps via a pair of "Y" pipes in front of the muffler that can be uncorked at the track. I'm wondering if this is a good idea or not. Any info would be appreciated.

 

cutouts you mean?

 

Yeah,

I guess that's what you call them. I call them "dumps" but the guy at the muffler shop called them header "caps". Anyway, good idea or bad.

 

A lot of people say you need the back pressure or you loose horsepower. I disagree, I think a supercharged engine needs as free flowing exhaust as it can get. Just opinions though.

I can tell you as fact though when I take the cut-outs off my truck I pick up about .5 mph in the 1/8th. Would probably equal close to a full mph gain in the quarter. Not very significant but definitely a gain. I also have a full Bassani exhaust. With a stock exhaust the gain would probably be more.

My cut-outs are located directly after my headers so they bypass the cats.

 

CLick here

 

Spankdog, thanks for that link. Those power cutouts look sweet. I think I will order a set. Sure beats crawling under the truck at the track.

I'm surprised other people didn't see gains though. My gains are very repeatable. In fact I go to the track almost every week and see the same thing every time. Guess different trucks respond differently.

 

Thanks for the info.. It looks like there have been various results with the cut-outs, I have read the "back pressure" post on the "L" forum and there is no clear advantage or disadvantage.
I think I will give it a try anyway because the cost is low, it's reversible and I know the nieghbors will love the sound. They just thought my bike was loud!

So here goes-I'm thinking about doing a dual set up with Fowmasters/cut-out/headers. I know there are lots of opinions about mufflers so I will just say 40 or 50 series Delta or no Delta. What do y'all think? The QTP cut-outs would be nice and a set of headers.

How tough is it to install headers? Who makes the better set?

 

You will most likely lose a noticable amount of low end torque but gain a little HP at the top, probably resulting in higher 60' times and higher 1/4 mile MPH. That's just my .02.

 

69roadster, i think your motor likes the cutouts because you're flowing a lot more air through with the ported heads and big valves. stock (internally) trucks may not realize gains, but its worth it just for the sound.

BTW i have the dual in dual out flowmaster it sounds good, great sound when just driving normally (not into the boost). doesnt sound as good as bassani or bullet at WOT but the blower drowns the exhaust out at full boost anyway. i dont think there is much truth to the Flowmaster = low end loss theory.

 

The fact is if you reduce the exhaust backpressure, you WILL lose lowend torque and gain upper RPM horsepower. This was noticable when I installed my MagnaFlow muffler which reduced the backpressure.

Take it for what it's worth.

 

i have cutouts, and jeebus its freaking loud, thats one good thing about the powerplates, you can close them when you get tired of the droaning, and if you see a cop you can close them rather quickly. i never noticed any sort of loss of power, in fact i thought the thing actually leaped out of the hole better than ever. i think it also my factor in what mods your running

 

thanks 01Lightning, I think you're absolutely right. the key is that you have a similar loss with *any* performance muffler compared to stock on the low end. people here just seem to be bashing on the Flowmasters and saying they are no good on our trucks.

 

TZR & 01Lightning Thanks for the objective view! It makes more sense than most of the things being said (probably by guys who have never even done a cut-out mod).

I would still like an oppinion on the 40 series vs. 50 and the Delat type Flowmaster. Also, is seperate dualls the way to go or is it best to use the single muffler setup?

 

At my 'home' track(SDR), if you're test-n-tuning, they require mufflers for street vehicles??????

Dan

 

With the caps off mine is loud, but not loud enough to be kicked off a track for. When I race my big block Vette I have 2 1/8" primaries running to straight-through 4" side pipes. That is the type of loud the track probably doesn't want. Makes the Lightning seem quiet by comparison.