2.5" vs. 3" True Duals
#1
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Join Date: Apr 2012
Location: MKE, WISCONSIN
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2.5" vs. 3" True Duals
Hey all,
I have a 00 SS with bolt ons, pacesetter lt, y-pipe, cutout and dyonmax catback. I am trying to decide between 2.5 tds or 3tds into the cme exhaust...I have searched and found both and mixed! 3 in x into 2.5..3 all the way, 2.5 all the way!!!
Will I get that much of a gain going to 3 or is it all just different sound between the two?
Also if I run duals, will I gain from having cut outs also?
Thanks for the input!
I have a 00 SS with bolt ons, pacesetter lt, y-pipe, cutout and dyonmax catback. I am trying to decide between 2.5 tds or 3tds into the cme exhaust...I have searched and found both and mixed! 3 in x into 2.5..3 all the way, 2.5 all the way!!!
Will I get that much of a gain going to 3 or is it all just different sound between the two?
Also if I run duals, will I gain from having cut outs also?
Thanks for the input!
#2
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Join Date: Jan 2011
Location: Michigan
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3" is just kinda the norm. I sacrifice no clearence with mine. The header collector is the lowest part of my exhaust and I'm under the axle. It might be choking it to the slightest degree but not enough to tell. Though a dyno will say otherwise..and you could get more of a popping sound with the smaller diameter piping. Cut outs imo are pointless when running duals. The hp vs $ for cutouts isn't worth it.
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#9
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Same here...if an engine is set to shift at 5500rpms and puts down 500hp peak at 5000 rpms is that going to use the same exhause setup as an engine that shifts at 7000 rpms and peaks at 6500? More rpms means more exhaust to get rid of. LSX motors just don't seem to conform to the tried and true rules in the exhaust world from what I've seen.
#10
TECH Junkie
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A better question is will 3" make more power. To say 2.5" is enough is not the big picture. Yes its enough to make good power but will 3" make more? I say yes. Maybe not much more but if its 5 more hp would you do it? What if you do heads/cam in the future? Then it might give you 10hp or more.