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cut outs vs mids

This is a discussion on cut outs vs mids within the External Engine forums, part of the LSx Technical Help Section category; what gives more power for a quick power gain? how much power do electric qtp cutt outs put out? about?? ...

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    Junior Member camaroboy 14 02 ss's Avatar
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    cut outs vs mids

    what gives more power for a quick power gain? how much power do electric qtp cutt outs put out? about?? and also how much power do mac mids give wit a ory ??? about? also can u put cut outs on stock manifols wit cats??

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    Senior Member tatertot91's Avatar
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    Quote Originally Posted by camaroboy 14 02 ss View Post
    what gives more power for a quick power gain? how much power do electric qtp cutt outs put out? about?? and also how much power do mac mids give wit a ory ??? about? also can u put cut outs on stock manifols wit cats??
    If i were you i wouldn't look into shorties
    A cutout would be better on the i-pipe right after the y
    My suggestion is to save a few more bucks and get some longtubes
    worth it IMO

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    Junior Member camaroboy 14 02 ss's Avatar
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    i know i want to buttt my car is sport line lownow...so????

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    Senior Member tatertot91's Avatar
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    Shorties may help a little
    a cutout will probably be better depending on your catback
    The mac setup has no cats so that may free up some power

    dont know the exact gains but either should help
    i personally would do the headers over the cutout

    cutouts sound muffed out on stock manifolds imo

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    Exalted Cyclops 67CamaroRSSS's Avatar
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    01's and 02's have the best exhaust manifolds. They are almost as good as shorties. Since you're lowered the stock exhaust under the tranny cross member (it's flattened) might be best as a round replacement might drag.

    Just adding a QTP E-cutout in the I-pipe (the usual place) gave my (otherwise stock at the time) 02 Z28 a 15 rwhp increase when open.

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    TEKNIK Teknik_SS's Avatar
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    I have the mac LT's and I think a off road y-pipe on my stock setup was lower then my LT's setup.

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    Member c5z28's Avatar
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    Quote Originally Posted by Teknik_SS View Post
    I have the mac LT's and I think a off road y-pipe on my stock setup was lower then my LT's setup.
    This^ the y especially on the driver side is generally the lowest point. I have 3" duals and the driver side just before the merge is lower than anywhere else.

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    Member danziger's Avatar
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    MAC mids through GM cats welded in the MAC Y-pipe (MAC cats are awful) gave me about 20rwhp. They are easy to install and tuck up nicely.

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    Quote Originally Posted by tatertot91 View Post
    If i were you i wouldn't look into shorties
    A cutout would be better on the i-pipe right after the y
    My suggestion is to save a few more bucks and get some longtubes
    worth it IMO
    Mids and shorties are completely different. Shorties are not worth it they don't flow much better than stock manifolds but mids are a different story. If you have clearance issues mids are a great alternative you lose a little over LTs but not as much as people think.

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    Member Siciliano15's Avatar
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    Quote Originally Posted by rc74racer View Post
    Mids and shorties are completely different. Shorties are not worth it they don't flow much better than stock manifolds but mids are a different story. If you have clearance issues mids are a great alternative you lose a little over LTs but not as much as people think.
    especially if u replace the awful mac y-merge with a true 3" or 3.5" flowmaster merge. probably within 2 or 3hp of longtubes. only difference will be that the powerband will probably be a little higher in the rpm range because longtubes are usually better for low end while mids are better for high end.

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    Member danziger's Avatar
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    Quote Originally Posted by Siciliano15 View Post
    especially if u replace the awful mac y-merge with a true 3" or 3.5" flowmaster merge. probably within 2 or 3hp of longtubes. only difference will be that the powerband will probably be a little higher in the rpm range because longtubes are usually better for low end while mids are better for high end.
    Truth. The ball-flange on the MACs is great for install, not so great for flow. If you clean up the welds and do the collector-mod, the MACs will make nearly the same HP as LTs. Probably won't get as much TQ as LTs, though...

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by Teknik_SS View Post
    I have the mac LT's and I think a off road y-pipe on my stock setup was lower then my LT's setup.
    +1. I had the Macs and the Mac Y pipe hung lower than my long tube set up.

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    Member devildogws6's Avatar
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    i have pacesetter lt on mine with sportlines it aint that bad

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    Member danziger's Avatar
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    Quote Originally Posted by INMY01TA View Post
    +1. I had the Macs and the Mac Y pipe hung lower than my long tube set up.
    I think he is stating the opposite. FWIW, my MACs and Y-pipe tucked up pretty well...

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    Member ls1wallen's Avatar
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    I got a cut out on all stock.

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    Quote Originally Posted by camaroboy 14 02 ss View Post
    i know i want to buttt my car is sport line lownow...so????
    that just means no slp headers. there are some headers that dont hang low compared to slp. i hear a lot of good things about pacesetters and kooks.

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    Miss October toi tyme's Avatar
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    I have a DMH e-cutout.. stock. sounds awesome everyone always thinks i have exhaust and im like nope just a cutout

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    why does everyone do a y pipe on these cars? doesn't a true dual exhaust give more flow? i haven't been in the ls1 game for too long yet, but i know the mustangs get the most power with an x pipe, and 90% of f body owners do not use them. is there a reason for that? is there a resource showing dyno tested anything?

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    Senior Member tatertot91's Avatar
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    Quote Originally Posted by the.palmetto View Post
    why does everyone do a y pipe on these cars? doesn't a true dual exhaust give more flow? i haven't been in the ls1 game for too long yet, but i know the mustangs get the most power with an x pipe, and 90% of f body owners do not use them. is there a reason for that? is there a resource showing dyno tested anything?
    Reason is not much space and you can't go over the axle on the driver side. Can go under, but its not as clean as it would be on a mustang.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by rc74racer View Post
    If you have clearance issues mids are a great alternative you lose a little over LTs but not as much as people think.
    Macs are actually great headers people over look all the time. They give a good h.p boost also.
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