[GTROB]

Wondering if anyone is running a catless DP > 90mm midpipe > stock rear?
I prob with get the HKS Tig rear, but for 3k seems like alot for a rear section...

I have AMS catless DP + Aam resonated midpipe being installed.

Thx!

 

[Dyjo1]

I had the same combo, the exhaust sounded very raspy. I ended up buying CBRD mid-pipe and the sound went away. AAM sells a 90mm exhaust for less than $1800, pretty good deal. I saw a Greddy 80mm exhaust on Jotech's web site for $1950.

 

[ATL_GT-R]

Catless DP > HKS res MP > stock exhaust. Sounds great and no meaningful power loss v. adding a catback.

 

[[email protected]]

We've done countless setups just like this. AMS 90mm non catted downpipes, CBRD 90mm y pipe, and stock exhaust will run very nicely with no issues.

http://www.forgedperformance.com/store/product.php?productid=16901&cat=430&page=1

Let us know if we can help in any way.

 

[RichM]

I'm running AMS downpipes (no cats) resonated AMS mid pipe and stock rear - love the sound and minimal drone- I would say no drone but I'm sure it must be there

 

[nlpamg]

I'm running AMS downpipes (no cats) resonated AMS mid pipe and stock rear - love the sound and minimal drone- I would say no drone but I'm sure it must be there

how is the smell and the soot on the car?

I already have a resonated HKS midpipe in and I'm planning on catless AMS downpipes (with the stock rear). I've been warned that I'll need to change out my midpipe to one that's catted b/c it'll be too loud, too smelly and put up too much soot on the rear bumper.

your responses are giving me hope!

 

[[email protected]]

I agree with Ryan, we have tons of customers running that setup and love it. You won't gain any power by adding the rear section until you run over 20psi on the factory turbos....ie E85.

Now the sound and look of a nice rear section is worth the money IMO

Hope this helps

~Cicio

 

[GTB/ZR-1]

how is the smell and the soot on the car?

I already have a resonated HKS midpipe in and I'm planning on catless AMS downpipes (with the stock rear). I've been warned that I'll need to change out my midpipe to one that's catted b/c it'll be too loud, too smelly and put up too much soot on the rear bumper.

your responses are giving me hope!

The OEM exhaust wont help w/ smell or soot--need the catted mid to get what you're after. And, BTW, there will be some soot @ WOT, even w/ that setup. Under normal driving, there's no soot or smell.

 

[nlpamg]

The OEM exhaust wont help w/ smell or soot--need the catted mid to get what you're after. And, BTW, there will be some soot @ WOT, even w/ that setup. Under normal driving, there's no soot or smell.

Well, I don't mind having a smell as I keep my windows up all the time. If there will always be soot with that setup, then there's really no incentive for me to change. My main concern is that I don't want it to be obnoxiously loud and I don't want any drone. So as long as the sound is somewhat subdued and the smell isn't overwhelming I think I'm ok.

 

[RichM]

how is the smell and the soot on the car?

I already have a resonated HKS midpipe in and I'm planning on catless AMS downpipes (with the stock rear). I've been warned that I'll need to change out my midpipe to one that's catted b/c it'll be too loud, too smelly and put up too much soot on the rear bumper.

your responses are giving me hope!

Thats what I had read- not sure how many of those writing had done it themselves- I am sensitive to overly loud and drone- thats why I took off my new Y-pipe (non resonated) and went with the resonated AMS- adding the Down Pipes may have made it a slight bit louder but I think you would only know if you heard them side by side- no smell and no big difference in soot accumulation from stock- mine is White and in stock trim sooted up a little

It may be that keeping the stock exhaust end is the key- no real power loss on stock turbos (seems to be the informed consensus from the tuners)

Rich

 

[[email protected]]

Thats what I had read- not sure how many of those writing had done it themselves- I am sensitive to overly loud and drone- thats why I took off my new Y-pipe (non resonated) and went with the resonated AMS- adding the Down Pipes may have made it a slight bit louder but I think you would only know if you heard them side by side- no smell and no big difference in soot accumulation from stock- mine is White and in stock trim sooted up a little It may be that keeping the stock exhaust end is the key- no real power loss on stock turbos (seems to be the informed consensus from the tuners) Rich

I tend to agree with you Rich. Personally I would do a non-res ypipe with stock downpipes, or resonated ypipe with aftermarket ypipes. However everyone has their own idea what is "loud" or annoying on the road, so its hard to give that advise.

As for the soot....I hear this alot....The GT-R will NOT soot up the rear of the car if its tuned properly even with straight pipes!

The soot is a sign of improper fueling, not a lack of muffler or cats.

~Cicio

 

[Murtaza]

As for the soot....I hear this alot....The GT-R will NOT soot up the rear of the car if its tuned properly even with straight pipes!

The soot is a sign of improper fueling, not a lack of muffler or cats.

~Cicio

I love my tune but I do have soot build up, so much so that I will need to polish the rear to get some of the caked stuff out. I am planning to switch to a catted midpipe. My setup is straight through with no resonators or cats.
Are you sure about this?

 

[celsius]

I ran this setup on my '09 over a year ago @ PIR (DP, 90mm midpipe, & stock catback)....here is the video. The car sounded REALLY good, but topend felt limited. After I went back to a full exhaust, the car felt better up top.

 

[Dyjo1]

I agree w/ Cicio, my GT-R is tuned by Topspeed and the soot didn't go up.

 

[CornedOutVR38]

What kind of power is gained by adding the rear section once you do have all the other bolt ons with E85?

I agree with Ryan, we have tons of customers running that setup and love it. You won't gain any power by adding the rear section until you run over 20psi on the factory turbos....ie E85.

Now the sound and look of a nice rear section is worth the money IMO

Hope this helps

~Cicio

 

[Cicio]

What kind of power is gained by adding the rear section once you do have all the other bolt ons with E85?

We have never done a direct test, but an educated guess would be 10-15whp

~Cicio

 

[REK125]

I am 150% sure. We have tons of guys running our tunes/e-tunes with full catless and I have never once heard anyone complain about soot. Nor have I ever seen such a problem after any of our customers have been tuned here.

We have never done a direct test, but an educated guess would be 10-15whp

~Cicio

One question please. I am by no means a tree hugger. However, how can you justify decatting daily driven cars on an environmental basis for a few more hp?

 

[ATL_GT-R]

One question please. I am by no means a tree hugger. However, how can you justify decatting daily driven cars on an environmental basis for a few more hp?

Yes . . . it allows me to run e85.

<- (no relevance, have just always wanted to use it)

 

[nlpamg]

One question please. I am by no means a tree hugger. However, how can you justify decatting daily driven cars on an environmental basis for a few more hp?

Après moi, le déluge

 

[OneFastDoc]

how is the smell and the soot on the car?

I already have a resonated HKS midpipe in and I'm planning on catless AMS downpipes (with the stock rear). I've been warned that I'll need to change out my midpipe to one that's catted b/c it'll be too loud, too smelly and put up too much soot on the rear bumper.

your responses are giving me hope!

Let me know when you do the DPs Phil. I want to hear how it sounds with our midpipe and stock rear section.

Kai