I just added Pacesetter headers and off-road y-pipe. Now I want to have a y-merge welded in the y-pipe and I can't decide which one I want, the Magnaflow 3"-3" or the Flowmaster 3"-3.5".
I figure the Magnaflow will be easier to install since it's just 3" out. Plus I already have a 3" cutout sitting around. Does anyone here have any experience with the Magnaflow merge? Does it sound decent?
I've heard some good things about the Flowmaster merge, but it's a 3" in and 3.5" out. I'd want to buy a new 3.5" cutout to keep from choking it, plus have a reducer put in to connect to the i-pipe.
What do you think? Is it worth it to pay the extra for the Flowmaster? Or will they both give me about the same gain and sound? My only modifications are in my signature.
If someone has used both I'd like to know if there is a sound difference or performance difference. Thanks.
__________________ 1998 Camaro Z28 M6 t-top w/ SS hood & free ram- air mod,SLP air lid,homemade Fernco bellow,throttle body bypass,Pro 5.0 shifter,Pacesetter headers,Pacesetter y-pipe,3" cutout,Flowmaster 80 series muffler
Coming soon:A new interior because of an f'ing water leak. Then maybe a LS6 intake and Flowmaster merge
I voted flowmaster because the merge is smoother, and it is much less wide than the magnaflow. The magnaflow is like 8 or 9 inches wide, and we all know there isn't much extra room under our cars.
__________________ 01 SOM SS A4 STOCK INTERNALS LIST #41...for a few more weeks anyway... 354rwhp 366rwtq SAE
I voted flowmaster because the merge is smoother, and it is much less wide than the magnaflow. The magnaflow is like 8 or 9 inches wide, and we all know there isn't much extra room under our cars.
Agree. That's why I run the Flowmaster.
__________________ 00 Formula Bright Silver A4 Bolt-ons, SS3600 stall, 3.42s; 12.47/109.62/1.71 09 G8 GT Black/Onyx 19's, sport pkg - stock - wife's car 69 GTO Judge 400 4 spd.
69 GTO 428 TH400 01 T/A SOM M6 - Sold
If you already have a 3" cutout just go ahead and get the magnaflow. I don't think by going with the flowmaster you are going to gain much more power over the magnaflow... maybe 3hp??..just a guess. If you go with the flowmaster, then you gotta try to sell your cutout and buy another.
The Flowmaster is both a better merge and is smaller. Why would you get the Magnaflow? It'll be harder to fit and it won't work as well. The Flowmaster is the only way to go between the two options.
were are you guys getting the 3/3.5 flowmaster merge?all im seeing in jegs is a 2.5/3.im fixing to buy one and would like the 3/3.5
__________________ 1999 trans am m6-Pacesetter lt's,custom 3 y-pipe with 4inch exit flowmaster merge,4" dynatec split flow race muffler,ls6 intake,FTP 85mm lid,SLP 85mm MAF, home ported throttle body 355rwhp/364rwtq FROST TUNED....Vengeance vrx5,4.10,spray and tune waiting to be installed
Is that a muffler welded in behind your merge and before your cutout? If so, how did that affect the sound with the cutout open? I have been considering having a muffler welded in to quiet it down a little for cruises with my wife and things like that, but I don't want it too quiet when I open the cutout. I've been trying to figure out how to fit in a cutout and an in-line muffler, but I was picturing it as being the merge, then the cutout, then the muffler, but now I'm wondering about your set-up.
Quote:
Originally Posted by blk99sleekbeak
were are you guys getting the 3/3.5 flowmaster merge?all im seeing in jegs is a 2.5/3.im fixing to buy one and would like the 3/3.5
Which y-merge? Magnaflow or Flowmaster? 
1999 trans am m6-Pacesetter lt's,custom 3 y-pipe with 4inch exit flowmaster merge,4" dynatec split flow race muffler,ls6 intake,FTP 85mm lid,SLP 85mm MAF, home ported throttle body 355rwhp/364rwtq FROST TUNED....Vengeance vrx5,4.10,spray and tune waiting to be installed 
