magnaflow catback

[LT1 > LS1]

no, you wanna leave 2 specific plates in it.....if you dont it will sound like shit....


he does this alot, I trust him. what we do is pull the cat off, cut the skin with the plasma cutter, do the hollowing, and removal, then weld the skin back on. place it back up, and you can pas a visual police inspection.........pretty slick huh?

[N20LT4]

no, you wanna leave 2 specific plates in it.....if you dont it will sound like shit....


he does this alot, I trust him. what we do is pull the cat off, cut the skin with the plasma cutter, do the hollowing, and removal, then weld the skin back on. place it back up, and you can pas a visual police inspection.........pretty slick huh?

I got ya now. You don't wan't that "clackidy clack" sound as I described it in another thread on here. I fully gutted the cat on my first F-body and the sound was unattractive to say the least. I ended up just going with a high-flow cat.

[LT1 > LS1]

yeah, thats what we wanna prevent. maybe bend a little sheetmetal and weld it in, to get the exhaust to flow a little smoother through there.

[Johns00Z28]

how the hell does a 3.8 with magnaflows on an american car=rice....?

There's a guy at my work w/ a V6 camaro and a magnaflow and it sounds horrible....definitely sounds ricey.

[jd1666]

There's a guy at my work w/ a V6 camaro and a magnaflow and it sounds horrible....definitely sounds ricey.

hope mine doesnt when i order my headers exhaust ory then cam later on

[Johns00Z28]

hope mine doesnt when i order my headers exhaust ory then cam later on

Yeah I don't know what all else he has done to it. Why not swap in an LS1 so you don't have to worry about it? lol

[jd1666]

Yeah I don't know what all else he has done to it. Why not swap in an LS1 so you don't have to worry about it? lol

haha ive thought about it but how much would it be to take the engine out and put a new one in from a mechanic

[shaolink9]

i like mine its quite at most speed idles good sounding to. but at WOT it wakes up !!! ONly things really comprble to it to are gmmg maybe tsp rumbler but the gmmg price tag is to steep for me .

[thiscatiskool]

Ive got the 2.5" magnaflow catback on 02 trans am and it sounds pretty good but i was wondering about the other 3" catback that they make. How do these two compare against one anouther in sound and in performance?

[LT1 > LS1]

Ive got the 2.5" magnaflow catback on 02 trans am and it sounds pretty good but i was wondering about the other 3" catback that they make. How do these two compare against one anouther in sound and in performance?

I didnt know they made a 2.5" system


definetly the 3" will make more power due to greater flow. as for sound, I dont know, it depends on what muffler you have.



after about 2 weeks, the exhaust got noticably louder, and was completley broken in. I love this system, and will try to get a video of the sound before and after I put the long tubes on it.

[N20LT4]

I didnt know they made a 2.5" system


definetly the 3" will make more power due to greater flow. as for sound, I dont know, it depends on what muffler you have.



after about 2 weeks, the exhaust got noticably louder, and was completley broken in. I love this system, and will try to get a video of the sound before and after I put the long tubes on it.

Not exactly true. If a motor isn't built to the point where it 'requires' that much airflow, stepping up the exhaust diameter won't yield addition power. I've been down that road with a bolt-on car. Going from 2.5 to 3" made no difference. Now with more extensive mods, surely it will.

[Crimson Sin]

I've heard 2.5 is enough up to 500 crank horsepower.. The Guru's like nhra or Sarge would probably know more. I went 3" on my car and sorta wish I didn't damn thing bangs on the PHR on good bumps.. Time for the BFH mod.

[BkFormula2001]

A+, 4 stars on Magnaflow's catback for the LS1. Easy install, affordable (300.00) and nice deep throaty sound. I highly recommend this catback.

[LT1 > LS1]

I'll make a video soon of the sound of a magnaflow 3" with 3" ORY, and stepped long tube headers.


you hear a little more chop at idle, and definetly more volume while driving. at idle and small amounts of throttle, its very very quiet. easy to sit in traffic, or listen to music

[01WS6475hp]

I like Magnaflow.Great quality and sound.

01 WS6,228/236,578/588 114 custom comp,ported/polished factory heads w/manley race master valves,978 dual springs,Comp titanium retainers,hardend pushrods,160 stat,MSD,NGK,SLP bellows/mass air,ARP ,BG ram air,3400 midwest stall,DTS 12 Bolt 3.73,Spohn sway bar,QA1s,BMR rear susp,Macs,ORY,Magnaflow