LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Flowmaster catback exhaust 2.5"?or3"?

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Old 02-16-2003, 09:40 PM
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Flowmaster catback exhaust 2.5"?or3"?

Im in the process of deciding what exhaust i should go with , i want to get the flowmaster american thunder system, there are 2 options either the 2.5" or 3" what i want to know is if there really is a big difference with that .5" ? do you get more horsepower? does it sound better? what are stock dimensions for a 93 z's exhaust? does the flowmaster come with 4" tips? the reason i ask is b/c its like a $100 difference between the two . any info would be great! thanks
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Old 02-16-2003, 09:51 PM
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you'll get more horse power out of.......

ANY OTHER TYPE OF EXHAUST OTHER THAN FLOWMASTER!!!!!


AS FOR SOUND.... hooker and flowmaster are the best!!!!

flowmaster flows worse than stock IMHO!!!
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Old 02-16-2003, 09:55 PM
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94TA ......... does it really??? wow thanks for the headsup, do you have any reccomendations? i dont want to spend more that $400. i have heard something about the hooker aerochamber, but i dont know to much about it. I am also going to gut my cat . thanks for replying
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Old 02-16-2003, 10:01 PM
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You want to go with at least 3", BTW your stock system is 2.75" so 2.5 would be a decrease.
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Old 02-16-2003, 10:07 PM
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Lunarson,,, what are the dimensions of your slp loudmouth,, is it 3" and how loud is it really? ive never heard it before , is it louder that corsa or borla, is it really loud inside the car ? at idle? full throttle? im also going to gut my cat. thanks for the info
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Old 02-17-2003, 12:25 AM
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I have a 3" flowmaster catback on mine. It was on the car when I bought it. It does sound good at WOT, but under normal driving it is kinda quiet. But I don't have aftermarket headers either, I heard that will help with the sound.
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Old 02-17-2003, 12:45 AM
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thats a nice looking T/A you got there@!, thanks for the reply.....

does hooker make a 3" exhaust ? b/c all i have seen were 2 1/2 in kits
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Old 02-17-2003, 12:48 AM
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I'd get a Flowmaster single 3" setup, and get another muffler to replace the Flowstrangler
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Old 02-17-2003, 12:53 AM
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what type of muffler does the Dr. reccomend?
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Old 02-17-2003, 01:27 AM
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stock doesnt flow better. anything is an improvement over stock
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Old 02-17-2003, 01:32 AM
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i think dynomax has a good muffler design but it is very quite.
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Old 02-17-2003, 02:38 PM
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I'm seeing the negative opinions about Flowmaster sound, but I've never seen any flow numbers that back those up. Does anyone have flow numbers that compare different systems?
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Old 02-17-2003, 02:51 PM
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In my opinion...bolt on a flowmaster for sound, because I think they sound bad ***, and then have a $30 cutout installed which will make up for the poor performance of the flowcrapper.
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Old 02-17-2003, 03:40 PM
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the only reason they make these flowmaster poorly flowing claims is either from jumping on the bandwagon or because they bought a different catback with a heavier price tag and would like to bash on people who bought a flowmaster catback because they paid less, have you noticed no one has ever posted factual information that demonstrates the crappiness of flowmaster?
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Old 02-17-2003, 03:45 PM
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My point exactly. I have never seen any concrete numbers posted here. I have flowed a Flowmaster system (not a Camaro part number) and found it to be quite low restriction, 3.2 in H2O at 700 SCFM, but I don't know how the OEM part compares to a Flowmaster replacement. If I get the opportunity (i.e. parts), I'll flow it and post.
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