electric cutouts
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From: Wilson n.c.
electric cutouts hi guys i have a 408 l92 heads intake 4l80e in a 94 silverado short bed with 1-3/4 headers and prob a 2in exhaust dual 3 chamber flowmaster mufflers straight thru cats.i know exhaust headers and muff are too small but i wanted to know how much hp will i pick up by using a cutout and where does it needs to be mounted before after cats straight off headers etc and what is a good brand to use i made 450rwhp the this full exhaust and a small cam
Fwiw I gained 5hp across the entire powerband when I put my car on the dyno but I have a typical fbody y pipe exhaust setup so it's kind of apples to oranges. You should put them before the cats, and as far as brand, I had a summit racing brand one and it was absolute ****. It fell apart twice in 6 months
Last edited by mjs1012; Nov 2, 2015 at 08:48 AM.
My Badlandz electric cutout from flea bay works like a champ. Its been on the car over a year. The cutout blade gets adjusted almost every time I drive the car. Meaning its not just sitting there closed or opened.
Right off the headers assuming they are longtubes. Then reduce down to whatever size piping after the cutout. With a 408 stroker I can see you giving up 50hp with 2" pipes, 3 chamber flowmasters, and 1-3/4 headers. That sucker needs 1-7/8ths and 2" would be even better along with 3' duals.
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Thread Starter
TECH Enthusiast
Joined: Dec 2012
Posts: 563
Likes: 3
From: Wilson n.c.
Right off the headers assuming they are longtubes. Then reduce down to whatever size piping after the cutout. With a 408 stroker I can see you giving up 50hp with 2" pipes, 3 chamber flowmasters, and 1-3/4 headers. That sucker needs 1-7/8ths and 2" would be even better along with 3' duals.
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I've had a QTP cutout for about 3 years now, and a DMH for about 2 years before that (until I broke it). The QTP has been holding up nicely though and never gives me any trouble.
I've been using a QTP for about 6 years.
The first one I had for 2 years and it gave me lots of trouble with the butterfly valve not opening and closing properly, however they updated the design and replaced my old one (in lieu of rebuilding) and it's worked flawlessly ever since.
Total roller coaster ride of a customer service experience, however I must give credit to QTP where it's due because they improved their design and made my situation right.
The first one I had for 2 years and it gave me lots of trouble with the butterfly valve not opening and closing properly, however they updated the design and replaced my old one (in lieu of rebuilding) and it's worked flawlessly ever since.
Total roller coaster ride of a customer service experience, however I must give credit to QTP where it's due because they improved their design and made my situation right.