I finished installing my TurboXS exhaust/ catless midpipe yesterday. I didn't do any WOT runs until today since I had to connect my wideband O2 sensor this morning.
First of all, this thing sounds sweet. Especially at initial startup and low rpms. Has a loud low growl. Gets louder at high rpms. The silencers will definitely go on for daily driving.

I did a WOT testrun in 3rd gear (EDIT: may have been 4th) and this thing is the real deal. My boost was at 10psi for the entire RPM range!! (8psi at first then up to 10, then 11, back down to 10). See video. Now this was with my boost controller OFF. Yes, I triple checked to make sure it was off! No gain or set boost values. Kindof freaked me out at first. I've heard of member's psi going up alittle after installing a midpipe, but not like this.
My AFR's did lean out a bit to 12.3 but there wasn't any detonation. I'll tune it to 11.8-12.0 later. I won't be able to do further testing until after the holidays.

Only thing I can think of is that the exhaust is flowing so much better , no backpressure.
The entire exhaust system is 3" the ENTIRE way. I believe this is the only exhaust that is truly 3" the whole way. I've did have the RP supercat that was gutted (3"), but my borla exhaust that I had goes from 3" to 2 (I think?) after the muffler. Also, I had tried the B&B catless midpipe which is 2.5" or 2.

Also attached is my datalogger screenshot from the testrun and the raw data. After looking at the data, it looks like I only went to 8k rpms, I was going to fast by then and had to letoff. Thought it was redline but I had my eyes on the AFR's and road most of the time. Still, notice the boost didn't drop, usually it starts to go down around 7k. Not to mention, I'm usually at 6.5-7psi at stock boost.

I believe rkostolni also installed the turboxs exhaust system and is waiting to get tuned. Should be interesting. I believe 300hp may finally be reached with the greddy turbo using this exhaust system (and Interceptor).

Video here

 

nice.

 

video has no sound

 

cool deal. i'm planning on the turbosx midpipe, but I just can't give up my HKS catback!

 

Why is your needle jumping around like that?

 

boost guage not RPMs :P just kidding

 

I'm so jealous. Good stuff Adrian!

 

I was playing back the gauge in my garage and recorded it. No sound needed.

I'm not sure if the midpipe will work with the HKS catback. Call up TurboXS and double check before ordering.
See this post.

 

very nice.

so do you think the the diff is the 3" catback as you shelled rp cat was 3"?????

beers

 

Why a double outlet? Would it not perform better with a single? Whatever the answer - I raise my glass to your post! You Adrian are charting new waters for sure.

 

Yes.
Borla and RB (plus other exhausts) have reducing pipes after the mufflers. The turbo XS is still 3" after the mufflers (see pics).

 

next ??? did you feel a diff between the rp cat before it went bad and after you shelled it???????

would be hard to answer, but have to ask for personal reasons...

beers

 

I couldn't tell a difference in performance. It wasn't broken or cracked, just loose on the sides causing it to slide up and down periodically. I noticed the noise when revving in low rpms.

 

So does this mean that a restrictive exhaust is reason we all aren't able to hold boost, and not the undersized turbo as we all thought before?

 

That is what he is saying. Hopefully I will get a chance to check out my boost levels w/ the turboXS today. My cars been at the dealer all week. If Ray is open next week I'll try to get down there for a dyno appointment. If we can hold 10psi with this exhaust I definitely think we'll break 300hp. We'll know soon enough.

Adrian, if the exhaust is too loud, Scott suggested welding in a Borla XR-1 muffler into the pipe. Its a 3" straight through muffler that suppose to have virtually no resistance but is pretty effective quieting things down.

 

seems to me it is the 3" midpipe making most of the difference. and i have the mid pipe with the borla xr1 muffler in it and it is not bad at all...

beers

 

Yup - makes me wonder why places charge a couple hundred bux for a peice of hollow, bent steel.




I'm thinking of making and selling test-pipes if I can turn that kinda profit.

:D

 

working with stainless steel is a pain in the rear

now mild steel...well if I update my tools to accomodate 3 inches (most are ready) well lets start fabricating them

 

hows the sound with the turbo adrian, in my NA videos the noise between the RB catback vs XS catback + midpipe will blow your speakers if you play the RB at max volume and keep it that way for the XS stuff (trust me )

Turbo drown out some of the noise or is it still very very loud?

 

You can fix the boost gauge flutter by tapping into the vacuum/boost line that goes from the throttle body to the Interceptor instead of at the intake manifold. Myne has no flutter anymore.

 

oh boy there is someone that once I tell him this information will be extremely happy...I'll link him to your post

thanks

-Jason

 

It's loud for my standards. I've seen your vids and mine is just as loud. I'll try and get some footage of mine reving and under load.
I still haven't used the silencers, hopefully they'll quiet it down alittle.

Thanks for the tip. I'll try that.

 

based on rkostolni and adrian's testimony, i'm considering going with the Turbo-XS set-up. looking forward to hearing the exhaust sound and seeing what the dyno says. this may get us over the 300 rwhp hump. we'll see. thanks guys, for your feedback.

dd sends...

 

so if 3" is the magic number supposedly (although we definitely need more evidence then what is presented)

then the new Agency Power setup should work too...it has 4inch titanium tips and 3inch TIG welded piping and includes a cat deletion pipe for less money too I believe

 

dont think anyone has it yet. would be curious if the mid pipe is compatibe with other exhausts. and how low it hangs.

beers