X Pipe crossover - Through Transom Exhaust
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X Pipe crossover - Through Transom Exhaust

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    Default X Pipe crossover - Through Transom Exhaust

    Call me crazy I think Im gonna get an x pipe made this week and fit it after my logs. Every car that I have done this to, which is a mustang and a charger daytona, I have seen a nice gain throughout the rpm's. I think this will be a fun little test for Havasu this weekend. Any input would be great in the mean time. Heat is my only concern. I may have to wrap it, which turn to crap fast with water. Ill keep you guys updated

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    Senior Member alek72us's Avatar
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    The x-pipe gave more gains then the cat-back/full exhaust. or more gains then the open headers?

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    I never ran open headers on either vehocle . I had true dual exhaust, just as my boat does. This lost torque and hp below 5000 but gained it above. After adding the x pipe it helped scavenging and made a healthy increase in power. I just want to see what gains I can make below 5000 on my boat especially since this is where o spend all my time

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by mygarageguys View Post
    Call me crazy I think Im gonna get an x pipe made this week and fit it after my logs. Every car that I have done this to, which is a mustang and a charger daytona, I have seen a nice gain throughout the rpm's. I think this will be a fun little test for Havasu this weekend. Any input would be great in the mean time. Heat is my only concern. I may have to wrap it, which turn to crap fast with water. Ill keep you guys updated
    I have done these numerous times, but not for performance gains, there really isn't enough back pressure to take advantage of equalizing the pressures, we always did it for fishing boats, reduces a lot of exhaust noise, especially at idle....

    Just my humble opinion.

    I used 3" schedule 80 T-6 aluminum pipe and ran a 1/4" fitting in the bottom of the crossover aimed upwards in the center of the cross....They work bitchen...Never saw any RPM gains though..
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Thanks for the reply. Noise elimination is a good thing if you as me. I like to be able to talk without yelling, that and I would love to be able to hear the stereo. I think I am going to give it a shot.

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    What is the 1/4" fitting for anyways??

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by mygarageguys View Post
    What is the 1/4" fitting for anyways??

    It sprayed a small stream of water up into the crossover to keep things cool and quiet. The crossover would run about 250* without it. When I added the spray fitting you could almost put your hand on it....Almost.

    I used a 1/4"NPT X3/"barb fitting and just teed into the water line for the elbows, worked well.
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Nice. How many DB's would you say it quieted it.

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    Quote Originally Posted by mygarageguys View Post
    Nice. How many DB's would you say it quieted it.
    One thing I wish I did was measure it, but I would say it took out the higher frequency exhaust noise and replaced it with a low frequency rumble, if that even remotely makes any sense...

    On a Redline 351 Ford in an aluminum jet it sounded more like an outdrive with thru prop exhaust...Pretty damn quiet.

    The 454 in a day cruiser was louder, but still made a huge difference, the owners son had Ligyrophobia (fear of loud sounds) and was able to cruise around at slower speeds (35MPH) with his dad after the change. Something he could not do before...He still had on his ear muffs (like a shooter would use) but didn't get freaked out...If I had to guess I would say it reduced lower speed noise by 25%.
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Yep. That is exactly what I am looking to do. A little more power would be nice as well but you can win em all. Ill Just have to see though.

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