This system looks pretty cool from Precision-Mini!

Don, why did you decide to go with the turbo style mufflers?

How loud is this system with a ported head and large Throttle body?

Do you have to modify the back bumper or is something going to be included with the kit?

Any idea on a price yet?

Please keep us up-dated with sound clips with HP and TQ numbers!

Thank -- Johan

 

how much is it going to cost?

 

Why turbo style mufflers: Because Stahl recommends them for performance.
Loudness: It is only loud under hard acceleration. With a head and larger TB I recorded 99 dbs in the driver's seat with the windows up.
Valance: A valance will be offered as an option. I don't run with it on because without it there is more room for a diffuser.
Price: The Stage 2 is being built and the price should be announced by the end of the week.

 

99 dBs! Are you kidding me? Hearing damage occurs way before this reading. Might as well sell your stereo system, unless you don't go WOT that often.

Man, I'm glad you gave those readings before I got interested in this muffler system.

Paul

 

Actually it isnt that loud for WOT. Check out this thread from a few years ago. https://www.northamericanmotoring.co...9&postcount=65
The Miltek exhaust is over 100 WITHOUT a header. Just something to think about...

 

this is a pretty nice looking system. are you going to give us numbers or are we going to wait till someone buys the system and does a write up? i like the cat back exhaust style

 

Big difference though.
Don said in the drivers seat.
The shootout was with the mike placed behind the car in line with the exhaust. I forgot the distance.

 

Good point...

Don, Any chance we could get some numbers from behind for comparison?

 

Hearing damage and stereos? Who listens to the stereo?
There are ways to quiet it down but it will hurt the performance of the system. For those who want it quieter a street muffler will be available.
Numbers: I write about that on my web site. Please read it. It all depends on what system you'd like.

Substantial HP increase guaranteed.

 

So those levels are for the race system?

 

Geez, you guys still have hearing? I haven't heard a word my wife's said for years...and she believes me when I tell her about the -normal- hearing loss that occurs as a guy ages. All I care about is the drone at 3500rpm (80ish in 6th).
Sorry to harp on the point, but if the removable section is a flex joint, then do you have to run the cat all the time? (Not that there's anything wrong with that...)
btw, why would you want a removable flex joint?

cheers,

 

The CAT is removable. The flex joint is removable because you can use a 4-1 collector and lengthen the primaries if you wish. 28" primaries are still rather short in the world of performance but it was the longest I could get with a split collector and good flex joint.
The dbs are with the sport mufflers. I'll post the street dbs in a day of two.

 

Those primaries are the longest I've seen on a MINI header, which in theory is good. Does the Stahl header require the Stahl cat-back exhaust, or is it compatible with other cat-backs such as the Milltek?

 

Mentioned earlier in the thread. You need the whole system.

Don;
if you can post estimates of output differences between sport and street modes.
Don't care about dyno numbers on the difference. Just your thoughts.

 

I'm curious about the header primary tuning lengths, and I applaud you for what looks to be a reasonable looking merge collector. I'm disappointed yet again with "turbo style" mufflers on a supercharged car. This system looks like will make power over stock from its reduction in backpressure, but it will not markedly improve VE like a properly tuned exhaust. I'm also wondering why the downstream O2 bung is SO far downstream of the cat. Are you providing a harness extension for both O2 sensors due to their relocation? The last problem I see is convincing people to hack up their rear-end aesthetics to accomidate tips that are in different locations to stock.

Good luck,
Ryan

 

I'll have the numbers most likely by Thursday and will post them soon there after.

 

--Do you truly know who Jere Stahl is, what he does, and has done through his Hall-of-Fame career?
--What style of mufflers would you like to see that you think will improve the VE?
--When I have time I'll post a picture of the rear view how it stands now. I also use a diffuser while at the track. The rear valance comes off for that.
--2 of the 3 O2 bungs require lengthening; nothing usual or difficult with that.
--This system is targeted for performance oriented customers. Those interested in sound and aesthetics might want to look elsewhere.
--The first run of the Stage 2 has already sold out. More are being made!

 

I like what Ryephile says. But Don's response is reasonable. If he's targeting the "race" crowd, then they are willing and prepared to do a lot of hand work to extend wires and cut valances. The rest of us want "plug and play" systems, and this doesn't look like one. I won't cut up my rear valance, but I'd be interested in a diffuser replacement that actually works (with data, etc.) I am willing to cut wires and solder them, but I'd prefer a plug and play alternative. I wish it came with the stock twice-pipes (as my darling wife Maria calls them!)
I hope this doesn't degenerate into a flame war. This is one of the best threads at the moment on NAM, so -pullease- keep it sane.

cheers,

 

Don, earlier in this thread you said:
It sounds like Stahl didn't actually design this MINI exhaust. It doesn't matter, using perf-core mufflers aren't ideal for this application when no resonator is upstream, regardless who designed it.

I know of Stahl's innovations, and they're exclusively pertaining to primary tuning and merge collectors, not the as-critical secondary tuning and resonators vs. mufflers. Like I said earlier, the header design looks impressive, which is of course a Stahl trademark. I just don't see the cat-back portion being as good as it could be, especially if your application is for the racer.

Regards,
Ryan

 

The entire system is Stahl. The only reason a muffler is there at all is for street applications or tracks with sound level limitations. We have the option of running a straight pipe at the track. There is also a quieter street muffler available.

 

I'm unclear: what did you like that Ryephile said?
Maybe I didn't make myself clear: this system is geared towards those with high performance in mind; it is not a mass market product. If you are unwilling to lengthen wires and remove or modify your rear valance this system isn't for you. (I’m working on making a valance replacement.)
This system comes with options to suit your needs such as primary diameters of 1 5/8, 1 3/4, and 1 7/8, a 4-2-1 or a 4-1 collector, and quick change mufflers/pipe.

 

Very Interested! Removable mufflers is a nice option. Also very interested in a rear diffuser for track days.

Keep us posted!

 

Beautiful header and proabably the only one truely worth the money. How much appr. is the Stahl Header

 

I'll know more about the pricing shortly; probably within a week. As soon as I get it I will post it here and on my web site.

 

Don,

I have another ? for you...I understand that this is mainly a race system but for those of us who choose to run this on the street, are we going to be seeing CEL or SES lights?

Thanks -- Johan