I disagree. With FI I say definitely do one. Just spend the $35 and do it manually and if it works upgrade to electronic.

On my single turbo LT1 (3" Borla) I installed a cut out and went from 479rwhp to 522rwhp and I picked up about 1 lb of boost. In my case my turbo needed to breath and the Borla was a restriction. After tuning and correcting air/fuel I ended up at 561rwhp.

With FI, do it.

 

Gains are going to be different with different set ups, it's that easy. Stock with a few boltons will probaly not really show what a head and cam car will. With a cut out your peak horsepower is going to be moved up the rpm scale, right where a head and cam car will love a cut out. It wouldn't hurt just to throw it on.

 

But your camaro/setup falls under les than .1% category

 

Ah. I've heard trucks around here with straight pipes and they're not terribly loud but I think I'm gonna get a cutout now

 

IMO, i would rather have an electric cutout than a catback/muffler/high-flow cat whatever. its cheaper, and allows you to run quiet or loud. very nice if you have to drive in cities with noise ordinances. as a bonus, the cutout motor is easily removed so it can be tranferred to a different vehicle. later!

jeremy

 

I closed my cutout for the first time since its been installed and it made my catback a lot quieter than just the cat back by itself. While its kind of cool, i want the corsas regular sound back. Anything i can do? I was thinking about making an instert of somesort to block off the openable side completely

Anyone else notice the muffling when closed or am i just losing my hearing ?

 

After having it open for a while your ears have probably gotten used to the abuse and now that its closed your just not used to it being so quiet in comparison

 

I have a cut out in my car with a cc306 cam and heads and it sounds awesome. I would have installed it even if it took HP out. It sound like a nascar for the exception i don't rev 9krpm

 

Cutouts outflow restrictive mufflers and sorry-*** expensive catback systems. Sorry, but that's the truth Less restriction = more power.

Mike

 

I'm sure you have dyno sheets and track runs to back up your "truth"

But I do agree less retriction is more power.

-Dustin-

 

Some enignes like more backpresure than others and will actually make less power with a cut out open. I know on my 396 bigblock that i used to have in my buick skylark that open headers slowed the car... i put on purple hornies and felt a seat of the pants difference in acceleration. I could be wrong but i dont think so.

 

No, your not missing anything, like I said before, some cars like cutouts some dont. It also depends on your other mods including the catback. I have seen dyno results were cars gain 5-10hp and ones where they lost 5-10hp, TQ was also sacrificed. I spoke with a very respectable aftermarket company and there is at least one catback that wouldnt see gains from a cutout. Wanna guess which one?

-Dustin-

 

Im really thinking about it since I do have forced induction. With my Y pipe and catback being 3 inch, will a 3 inch cutout work or not?

 

yes a 3" cutout will work.