Searched threads about loss of exhaust velocity dropping the low end on an NA vehicle but here is my question anyway.

I am finishing my 03 Z for my baby brother. The engine is heavily modded with CAMs, Bore/Stroke, etc... CAI, Custom headers, UTEC, larger fuel injectors, and a Walbro with RF kit. Should I see a serious problem with a dual 3" exhaust. That is a dual 3" custom welded straight pipes all the way to HKS carbon cans on the back. I hate to pull that ***** off if I don't need to.

Also, the car MAY in the future get a SC thrown on the front if he can prove to me that he knows how and when to drive a car fast.

Any advice is much appreciated!

 

Pics, or it never happened.


That's all I can contribute.


But seriously, pics would be awesome.

 

Just out of curiosity, are the HKS cans 3" in and out?

 

Have you considered using a system that has already been proven to make power? The dual 3 inch shockwave from motordyne might be a good choice. It's pretty expensive, but it sounds sexy as hell. I believe Gabe3d uses said exhaust in his 4.15L NA build, and makes awesome numbers.

Check out this custom 3 in dual system, its on a G sedan, but you would end up with a similar noise. Vids are near the bottom. Unfortunately there are no before/after dynos, but im sure your results would differ anyways, due to using a different fabricator.

https://my350z.com/forum/intake-exha...quad-tips.html

 

Utec? Get uprev please.

And why a DUAL 3inch when a single exhaust will make about the same power, while costing and weighing less. In fact, you could unbolt the exhaust a few inches after the Y pipe, and it really wouldn't make a difference.

 

I'd go for a single 3" over a dual for NA. No matter how hardcore of a build it is, dual 3" is still way too large.

 

i had APS and AAM 3" TD exhaust on my car and it never "Felt" Like i loss power.

 

The dual is on the car already. This thing was TT'd making close to 700RWHP at one point. I parted out the FI portion of the build to give this car to my brother since I moved on to another platform. As long as power drop isn't significant I don't care to make investment in another exhaust or do the work. It's extremely high quality build and cost me about $2500 to do so I hate to just get rid of it.

I can't locate a dyno anywhere comparing numbers. I see some of you have done this, any dyno sheets to show the losses or just buttchecks?

Thanks!

 

Even a 3" single is a way to big. Go with a 2,5" single, max 2,75". I know, you americans like it big, but even a 2,5" true dual is fine for 750 hp TT Z. No need for 3" true dual till this power lvl.

 

I'd say go for it. I've seen dyno proven results that say VQ35DE's love 3 inch exhausts.

 

German guy please don't post opinions if U hve no idea WTF ur talking about. Op if it cost 2500$ then keep it. Who cares if u lost hp or tq not that big of a deal on NA

 

your an idiot.