Exhaust Cutouts after header before cat

Viper Beau

Viper Beau

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I looked at several of the threads but was unclear of the cutout placement. Has anyone attached a "Y" to the header flange with the exhaust cutout on the bottom of the "Y" and the rest of the exhaust system to the top of the "Y". In effect, this would dump directly from the headers when open bypassing the entire exhaust system and most importantly the restrictive cats. Theoretically, wouldn't this way allow the engine to breath even better than putting the cutouts after the main cat? Has anyone done this and what are your thoughts in terms of sound and performance? Sorry in advance if this is a dumb question. I am not as versed as many of you are hence the reason I joined the forum. I appreciate any info you my share. Have a good Holiday.
 
I had race cats on my exhaust with full length headers and I asked DC Performance if cutouts before the cats would help and they did not recommend them as they said these engines need some amount of backpressure to be efficient.
 
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WARNING THESE THINGS DONT SOULD LIKE THEY DO ON A HEADS AND CAM LS1..................
 
Beau, What Ike is trying to say is they sound like shit on our trucks. A cross between a UPS truck with a busted muffler and a dump truck. (No offense Eddie):D :D :D
 
Yeah not worth the money or effort...I;ve only had em open like 2 or 3 times.. Once on the track and it made not effect on time or mph...

When you have em open its just raspyness that vibrates everything, not a deep rumble as was expected
 
Gentlemen,
Thanks for the info. I saw other threads mention the same, that they didn't sound well. I am about to put some Bassani headers on. Any recommendation on the mid pipes. I have the stock 4 cat set up and from what the forum seems to say, the best thing is to get rid of the secondary cats, keep the primaries, or get mid pipes with high flow primaries. I am partial to the Billy Boat set up. What have you heard? Again, I apologize in advance if this is digging up old threads.
 
Viper Beau said:
Gentlemen,
Thanks for the info. I saw other threads mention the same, that they didn't sound well. I am about to put some Bassani headers on. Any recommendation on the mid pipes. I have the stock 4 cat set up and from what the forum seems to say, the best thing is to get rid of the secondary cats, keep the primaries, or get mid pipes with high flow primaries. I am partial to the Billy Boat set up. What have you heard? Again, I apologize in advance if this is digging up old threads.
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As far as the cats go, you'll get more power from removing all 4. But, depending on where you live, you'll have problems passing emissions.
The BB system sounds great:rock:
I have Belanger LTs, 2 hi flow cats, and magnaflow.... you won't hear any complaints from me.
 
Hey gut the front 2 cats those are the restrictive ones.................

takes 1 hour

I just re-installed the back two on mine. Alittle to raspy and droney..... :)

now its perfect again.................175 dollars latter LOL 100 to remove them and 75 to put them back on !!!!!!!!!!!!!! LOL in one week!

its been said that the fronts give you 17 HP and both 22-25
 
It sounds like the next best thing to removing all 4 cats is to install 2 high flow cats, if I don't want emission problems?
 
Viper Beau said:
It sounds like the next best thing to removing all 4 cats is to install 2 high flow cats, if I don't want emission problems?
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Where do you live? what tests do they do there?
 
I live in Florida and they don't do anything in regards to emissions (for now anyway). You think its better to go catless? I don't want to be too loud around the neighborhood. What is eliminating both cats going to do to the sound volume?
 
any suggestions on a good vendor for the catless mid pipes?
 
I have Belanger headers with high flow mids. I had the cats cut out and v-band clamps welded in on the cats and on a set of Jersey dumps(y-pipes). The truck is crazy loud at 70 mph with the dumps in/closed. The sound is much more bearable with the cats in. Dyno proven, back to back runs- 4 hp gain by using the y-pipes/closed. Not worth it on the street, IMO.
 
I strongly sudjest gutting the fronts and leaving the rears.............. Then you could install spark plug non foulers before the rear o2s and you'd pass emissions.

And save up for Justins catless or catted mids.

you can gain 17 HP in 1 hour. I wish I'd have done it 2 years ago :)
 
I keep saying it over and over again about the cut outs, one word for a nice deep mean sound, CAM.........
And I still have cats on too complete bb sys, to the cats then the cutouts and then the muffler pipe.
 
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