jlrz28

iTrader: (7)

Right now I have 1 7/8 headers into a 3" y pipe with high flow cats into the flow master merge then a cutout right at the I pipe. Thinking about running either Dual cutouts in the y pipe or possibly just running 3" true duals to mufflers dumped at the rear.

HCI2000SS

iTrader: (2)

Why run dual cutouts? I'm just curious. My setup consists of 1 3/4" headers into 3" ORY, with a FM merge running into a Magnaflow 14419 bullet muffler in I-pipe section, then through a aftermarket catback

jlrz28

iTrader: (7)

I am thinking that I might be able to pick up some power changing the exhaust/ just getting it out faster. Everything I am seeing/reading seems to point that way.

HCI2000SS

iTrader: (2)

Gotcha. I was always under the impression that a single cutout was more than enough, and that dual cutouts wouldn't do much of anything. So you run 10.3 at 129 right now? What does your car weigh?

jlrz28

iTrader: (7)

Yeah that is what I am not sure of. That's why I ask. Can you get too big? Just figured getting it out as fast as possible might be some gains. Car weighs around 3300 maybe a simpler exhaust would lighten it?

HCI2000SS

iTrader: (2)

To be completely honest I'm not sure i'd mess with anything here lol. You car seems to run extremely well as it is for the mods and weight. From what i've seen seen running good 1 7/8" headers with a good y-pipe and proper merge, and a cutout right afterwards, is about as good as ot gets

sxc Z28

After you go into a LS motor the 3'' Y-pipe becomes a restriction. If your asking for the setup in your sig you need to get the Y off ASAP. Duals dumped at the axle has my vote.

jlrz28

iTrader: (7)

Has anyone seen any dyno or track gains? I looked but can't seem to find anything.

sxc Z28

This guy went from 3'' Y to 4" Y. Duals would've done even better IMO. Read all of it not just OP.

https://ls1tech.com/forums/dynamomet...t-upgrade.html

You have more cubes and everything you will benefit greatly from throwing the Y-pipe away.

SoFla01SSLookinstok

Your car does run awesome. My opinion would be to get the TD dumps. I bet you would gain & the engine will love it. Just a guess of coarse.

If you remember my car the exhaust has went through several changes. Going TD made it feel like a different car. Although I didn't have a cut out like you. Then going from 1 3/4" to 2" headers made many changes in the engine. All for good. Maybe the only negative is I have to get the pass. rear plug from the top now. The big pipes blocked access from under the car. No big deal

You do have a bigger motor with the 1 7/8" already. Maybe start with the TD. How much do you want to spend also. Good luck man.

sxc Z28

^I agree. 2'' primaries would be good here too but the Y-pipe is the bigger concern to me. If you can swing doing both by all means do so. Texas Speed has pretty good 2'' headers and TD dumps.

ragtopz28

iTrader: (57)

https://ls1tech.com/forums/attachmen...r-dsc04648.jpg
Since you posted in the drag section, I assume you are looking for flow and light weight. 3" to 4" merge and a 4" bullet. Seems to work for me.

jlrz28

iTrader: (7)

Yeah I've looked at 2" primaries quite a few times. Heck the motor was on the engine dyno with 2". I am still running the stock k member and not sure that they would fit.

jlrz28

iTrader: (7)

That is basically what I have now just with cats and a cutout.

sxc Z28

I have a aftermarket k on my bolt-on car lol if you work on your own vehicle it is one of the best mods because it creates so much room for activities and weight off the front is good too.

2'' primaries if you can and duals for sure.

JL ws-6

iTrader: (50)

Run the headers and nothing more and that will be the fastest if retuned for it. Least amount of weight, and it will be the least restriction, which is always fastest.