Stock Exhaust Modification! Help

corbin09 · 08-03-2010, 01:48 PM

Hey all,
So I am not new to modding cars, but usually I just go with aftermarket products that are pre-fabbed for the car already. On the z I have gone a little different route and need some help/opinions. Please dont flame for lack of knowledge, explain it to me and I will be grateful!

I had an exhaust set up that consisted of test pipes, a top speed Y pipe, and a custom single exit muffler. The piping going into the single muffler was 3 inches from the y pipe back. This setup had a good increase in the "butt dyno" but I didnt ever have an actual dyno performed. The reason I got rid of this setup, was because besides it being slightly loud, the flex pipes on the y pipe would slightly rattle, and make a noise that I could not stand.

I recently changed the exhaust to a different setup, and It feels like I lost a decent amount of power, So I am looking to see if there are suggestions, or something I could do to regain some of it. It feels like I lost most of the power in the lower rpm range.

I switched the setup to Test pipes (the same ones), and then I had a muffler shop weld in some pipes to the stock muffler and bolt up. The pipes running from the test pipes are 2.5, and they run into the stock muffler with flanges. This quieted the car down a good deal, I did use some 2.5 inch resonators as well. The car is quiet when you are regularly driving, but when you get on it it is very loud. I like the sound, I am happy with it and it doesnt bother me. The power or proposed "feel" of the loss of power is what bothers me. Should I maybe add an x or y pipe to this setup? Has anyone else run this set up and noticed the same thing?or a loss in power from the stock configuration?

I will post up a video and pics as time permits. It sounds great so this may be an option for those who want a little additional sound, although I am sure a lot of the sound comes from my test pipes.

Any help or suggestions would be appreciated. I will be buying a nice exhaust system when I go FI, I just dont want to bite the bullet on something now, And I am currently looking into the sts kits which would render my exhaust useless anyways. Please Advise! Thanks in advance for the replies and help!

NYBladeZ · 08-03-2010, 02:08 PM

You might want to get a tune but you shouldn't feel a noticeable difference. I know some people say with the Y pipe you get more mid range grunt.

However, I believe the real reason is because you had potentially the lightest and most efficient flowing exhaust setup with the single muffler, now you've baffled it quite a lot. You may want to unhook your battery so the ecu resets, it is probably still compensating for the previous exhaust.

corbin09 · 08-03-2010, 02:19 PM

Yea, I did unhook the battery... but there was not much of a change. I guess the other exhaust was just more efficient. I will just have to play around with it I guess.

NYBladeZ · 08-03-2010, 02:34 PM

a larger single exhaust is definitely more efficient. How'd you build it, do you have any pictures??

corbin09 · 08-03-2010, 02:37 PM

How did I build the single? I just had someone weld a 3 inch pipe and flange to the Y pipe, and then it was 3 inches all the way back to a single GReddy Muffler. I will have to see if I can dig up some pics.. I didnt really take a whole lot of pictures, bc when people did see it, a lot of bashing came about because of it and the whole " it comes with 2 tips you need to keep it that way" I will see if I can dig any up but I dont think I have any.

fairladyZ34 · 08-03-2010, 05:02 PM

single exit can be sick, and im sure you could fill in the bumper to make it look nice

08-03-2010, 01:48 PM	#1 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 279	Stock Exhaust Modification! Help Hey all, So I am not new to modding cars, but usually I just go with aftermarket products that are pre-fabbed for the car already. On the z I have gone a little different route and need some help/opinions. Please dont flame for lack of knowledge, explain it to me and I will be grateful! I had an exhaust set up that consisted of test pipes, a top speed Y pipe, and a custom single exit muffler. The piping going into the single muffler was 3 inches from the y pipe back. This setup had a good increase in the "butt dyno" but I didnt ever have an actual dyno performed. The reason I got rid of this setup, was because besides it being slightly loud, the flex pipes on the y pipe would slightly rattle, and make a noise that I could not stand. I recently changed the exhaust to a different setup, and It feels like I lost a decent amount of power, So I am looking to see if there are suggestions, or something I could do to regain some of it. It feels like I lost most of the power in the lower rpm range. I switched the setup to Test pipes (the same ones), and then I had a muffler shop weld in some pipes to the stock muffler and bolt up. The pipes running from the test pipes are 2.5, and they run into the stock muffler with flanges. This quieted the car down a good deal, I did use some 2.5 inch resonators as well. The car is quiet when you are regularly driving, but when you get on it it is very loud. I like the sound, I am happy with it and it doesnt bother me. The power or proposed "feel" of the loss of power is what bothers me. Should I maybe add an x or y pipe to this setup? Has anyone else run this set up and noticed the same thing?or a loss in power from the stock configuration? I will post up a video and pics as time permits. It sounds great so this may be an option for those who want a little additional sound, although I am sure a lot of the sound comes from my test pipes. Any help or suggestions would be appreciated. I will be buying a nice exhaust system when I go FI, I just dont want to bite the bullet on something now, And I am currently looking into the sts kits which would render my exhaust useless anyways. Please Advise! Thanks in advance for the replies and help!

08-03-2010, 02:08 PM	#2 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	You might want to get a tune but you shouldn't feel a noticeable difference. I know some people say with the Y pipe you get more mid range grunt. However, I believe the real reason is because you had potentially the lightest and most efficient flowing exhaust setup with the single muffler, now you've baffled it quite a lot. You may want to unhook your battery so the ecu resets, it is probably still compensating for the previous exhaust. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

08-03-2010, 02:34 PM	#4 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	a larger single exhaust is definitely more efficient. How'd you build it, do you have any pictures?? __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

08-03-2010, 05:02 PM	#6 (permalink)
fairladyZ34 A True Z Fanatic Join Date: Aug 2009 Location: Central NJ Posts: 1,577 Drives: 08 G37S Black M6 Rep Power: 18	single exit can be sick, and im sure you could fill in the bumper to make it look nice __________________ From Z to G to BMW and back to a G! Nismo for life

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08-03-2010, 02:19 PM	#3 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 279	Yea, I did unhook the battery... but there was not much of a change. I guess the other exhaust was just more efficient. I will just have to play around with it I guess.

08-03-2010, 02:37 PM	#5 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 279	How did I build the single? I just had someone weld a 3 inch pipe and flange to the Y pipe, and then it was 3 inches all the way back to a single GReddy Muffler. I will have to see if I can dig up some pics.. I didnt really take a whole lot of pictures, bc when people did see it, a lot of bashing came about because of it and the whole " it comes with 2 tips you need to keep it that way" I will see if I can dig any up but I dont think I have any.