Thanks Patrick G Nice Gain with Flowmaster Merger Y Pipe.

[SLOW30th-TA]

Originally Posted by udienow

Thats kinda what I did, except I do not have a cutout yet, but will soon.
I had that same exact ORY in pic 1.... I hated how it sounded... mad rasp and a hammering noise from 2000-2500 RPM. So I bought a flowmaster merge, and had that installed. Now car sounds better, tho still a bit of rasp... The merge I got though was a 3" to 3.5"... not 4" like the OP did. Maybe rasp would be gone if I had went with the bigger merge. Nonetheless it was worth every penny and I would suggest to anyone to go with this merge.
On a side note, where do u get a stainless cutout like that but in 3.5"? Price?

Ticks Performance has Cutouts in 3 inch, 3.5 inch and 4 inch...all the same price I believe.

[dug]

Originally Posted by Patrick G

Good report. One 3" pipe slamming together into another single 3" pipe is not an ideal way to construct a y-pipe for making power (or sound). The Flowmaster merge collector into a 4" pipe is a good mod. Does the tone sound any different?

I dont understand why header companies dont bother to put in a decent merge for their ypipes. Theyre missing out on half the gains

[corvet786c]

As far as I am concerned My Pacesetters are just as good as anyother Header out there now. Considering what I did. Maybe +/- 2-3 rwhp

[green28]

Originally Posted by Patrick G

The idea is to go from this:



To something more like this:

Is that first pic a pacesetter ORY? And is that the same y-pipe modifed in the next pic? I need to change things up on my setup, which is PS LT's, PS ORY, and LM1. I'm thinking the merge and a bullet muffler might be enough to have a little bit tolerable setup.

[Striker]

So this flowmaster merger Y-pipe can be used together with any aftermarket long tube headers and replace the factory Y?

[TORCHD 02 TA]

Originally Posted by Striker

So this flowmaster merger Y-pipe can be used together with any aftermarket long tube headers and replace the factory Y?

the flowmaster merge is not a y pipe. it is the piece between the red lines

[rusty2198]

ok now you have my attention are you guys still using the ORY and just cutting that area out and installing this are you fabbing up a whole new y-pipe?

[KurtRardin]

Exactly. Check out the link in my sig on the 4" PaceSetter Y. Hacking out the pacesetter merge and puting in a flowmaster merge made for a huge sound improvement. There was a noticeable drop in bottom end, but a huge difference on the top.

I bet that Y pipe above with the dump sounds badass.

[Striker]

Originally Posted by TORCHD 02 TA

the flowmaster merge is not a y pipe. it is the piece between the red lines

thanks for the clear explanation boss- so now do we just install this piece in place of the existing Y pipe? Also, can this be fabbed up to a catted Y pipe?

[Soul TKR]

The bbk Y-pipe has a nice merge as well...

[corvet786c]

Remember very important not any y merger will give u the desired results. You want a 3 inch dual merger goin into a 4 inch intermediate pipe then back into a 3 inch exhaust, like patrick states anything smaller than 4 inch will not get desired results. My exhaust tone changed. No more drone and picked up about 10 rwtrq from 2500-4000 rpms.

[TORCHD 02 TA]

Originally Posted by Striker

thanks for the clear explanation boss- so now do we just install this piece in place of the existing Y pipe? Also, can this be fabbed up to a catted Y pipe?

Basically you take this piece, cut of the merge on you pre existing Y pipie and you weld this one to it.

But to be honest why go thru all the trouble and do what i said above, when you can make custom 3" Y using the Flowmaster merge for less? That is what i did...

[matt94z]

What is the part # for the FM merge? I can't find it on Summit's website...

[TORCHD 02 TA]

Originally Posted by matt94z

What is the part # for the FM merge? I can't find it on Summit's website...

flo-y300350

[Striker]

That's true too. I guess you can just give the muffler shop the flowmaster merger and tell them you want a 3inch Y pipe, rite?

[corvet786c]

What is the part # for the FM merge? I can't find it on Summit's website


NO The correct part number is Flo- Y300400 Again u want to use a dual 3 inch go into a 4inch. I could be a cutout or exhaust system. Mine is a LM Exhaust.

Example: I run pacesetter LT. I bought TSP Catted Y. I had the muffler shop cut where both y pipes come together and make a dual 3inch as u see in patricks photo exactly like that. Weld the FM on your y pipe then use a cutout or in my case an exhaust system.

[TORCHD 02 TA]

Originally Posted by corvet786c

What is the part # for the FM merge? I can't find it on Summit's website


NO The correct part number is Flo- Y300400 Again u want to use a dual 3 inch go into a 4inch. I could be a cutout or exhaust system. Mine is a LM Exhaust.

Example: I run pacesetter LT. I bought TSP Catted Y. I had the muffler shop cut where both y pipes come together and make a dual 3inch as u see in patricks photo exactly like that. Weld the FM on your y pipe then use a cutout or in my case an exhaust system.

You don't need to go 3" into 4". i have the 3" into 3.5" you will need a reducer regardless

[corvet786c]

Originally Posted by TORCHD 02 TA

You don't need to go 3" into 4". i have the 3" into 3.5" you will need a reducer regardless

Merging the twin pipes coming off the headers is a critical item for power and sound quality. Vettes have it easy because an x-pipe easily fits and the sound quality is awesome. F-bodies are handicapped because of space constraints. For 500 rwhp, you want to run dual 3" pipes after the headers and you'll want them to merge into a 4" intermediate pipe. Anything smaller will run the risk of flow loss. Most y-pipes on the market slam the 2 pipes together like this:

This is a quote from Pat G 500 rwhp Recipe. You can do what U want but I followed what He had said Mine is 3inch running into a 4 inch back to 3 inch. Now it has great flow. Anything smaller than smaller you run risk of flow loss.

[TORCHD 02 TA]

Originally Posted by corvet786c

Merging the twin pipes coming off the headers is a critical item for power and sound quality. Vettes have it easy because an x-pipe easily fits and the sound quality is awesome. F-bodies are handicapped because of space constraints. For 500 rwhp, you want to run dual 3" pipes after the headers and you'll want them to merge into a 4" intermediate pipe. Anything smaller will run the risk of flow loss. Most y-pipes on the market slam the 2 pipes together like this:

This is a quote from Pat G 500 rwhp Recipe. You can do what U want but I followed what He had said Mine is 3inch running into a 4 inch back to 3 inch. Now it has great flow. Anything smaller than smaller you run risk of flow loss.

You are not going to lose any flow from 4" into 3.5".... On the merge, the 4" part is only like 2" long. You tell me from that portion you are going to gain a lot?

[dug]

dr gas that makes the nice xpipes recommend merging the pipes into one thats .5" bigger. 3.5" would be fine. Probably makes better torque than the 4"merge