True Duals Or Catback???
I believe duals might make a little more power over a well designed cat back, but as far as "is it worth it?" That's up to your wallet.
https://ls1tech.com/forums/advanced-engineering-tech/398761-two-must-reads-advanced-engine-heads.html
also try a title only search for "dual" or "duals" - lot's of info out there
https://ls1tech.com/forums/advanced-engineering-tech/398761-two-must-reads-advanced-engine-heads.html
also try a title only search for "dual" or "duals" - lot's of info out there
I think a well done y pipe setup with flowmaster merge and a good catback like the dynomouth or hooker or magnaflow will flow just about as good as any true dual system without the hassle and interior noise.
here's my dyno from the wife's car comparing the borla 3" adjustable catback to the bassani tru-duals. granted i'm not making 500, but i think it did pretty well. this was on stock cam as well. and the cabin noise was way less with the bassani.
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Launching!
Joined: Aug 2005
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From: Scottsdale Arizona
Go with a good catback if youve got the budget get a borla adjustible sound and driveability is great. If you go with true duals you will make i little more power but you wont even get over a speedbump at 2 mph with your car going almost completly sideways. if you want more sound from the catback get a cut out or remove your
cat(s).
cat(s).
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Verdad Gallardo i have no clearance issues with the bassani. and it goes all the way out back. main reason why there's no ground clearance issues is because the one muffler is in the stock location. you could buy the borla adjustable if you want. and leave 15 rwhp on the table to boot.
DONT DO THAT!!! if someone really wants it they can buy my LM...way too raspy with LT's and ORY 
TECH Apprentice
Joined: Jan 2004
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From: san clemente
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Im in same dilemma. I have borla adjsutable right now. But plan on going LTs here real quick. I want an exhaust to really rip and sound super loud. Police around here dont care. Im lowered on 18s and am not sure if i can go duals do to major ground clearance. However i hear my borla sounds horrible on LTs, ORY and no cats. Should i get the LTs, ORY and cutout for my borla, or sell the borla, get TSP or bassani duals, or get a diff cat back? I know duals have the extra power but i dont want to be scraping everywhere.
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Duals all the way. Mine hang lower than they should, but I still clear all speed bumps and I'm lowered 1/2". Power gain was amazing and sound is unreal. Yes, there is some interior noise, but not as bad as I thought it would be. I am getting ready to finish the duals out under the axle and out the rear to reduce my interior noise, but I would never go back to a catback. I've lived with the noise for almost a year now, and it is bearable. But I think I will enjoy it more once it is out from under the car.
