CAT BACK?
 

witch cat back makes the least noise?

stock

lol. Other than stock Magnaflow or perhaps Cobb.

why would you ask for a QUIET cat-back? thats like asking for a virgin jack and coke.

cat-back = ~no performance gain.

edit: wrong quote @m249saw. ment for @miamispeed3

You can always weld a resonator into any CBE to keep it quiet. But, since the airflow restriction is not in the CBE, but further upstream, the only reason to get an aftermarket CBE is for the ricey sound. There are slim to no performance gains to be had. To spend money on a CBE and then muffle the sound kindof defeats the purpose: no net change, but you're out a pile of cash. Spend the money on a good DP instead.

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The Magnaflow is actually quieter at higher RPM's than stock, and has a great tone down low. Happy with mine.

Open downpipe

got 2 keep it under 95db 4 autox @ my local venue

That's all very well and good, but why bother with a CBE when it doesn't give you any performance gain and you can't have the car much louder than stock anyway?

just do the second cat delete. That's supposed to yield some gains, the rest is going to be a waste of cash flow.

Catless dp, tp, and res delete. Fucking win.

I run Ultimate-Racing high flow Catted Down pipe, test pipe and CBE. It's a loud exhaust but no issues at local autox events. Great sounding exhaust and who ever said that a CBE is to get ricey sound.. Well their full of shit. Our cars actually sound very good with an upgraded exhaust. Not ricey at all. Deep grumble and likes to crack/fart/pop. It is a lot of money for sound, but I've just removed all my engine mods besides my FP internals, the turbo back exhaust and AP. The car feels just as fast as it did with my CPE TMIC, corksport Sri/tip and forge BPV w/perm tune. If I could do it all over again I would of just bought the internals, ap, and Downpipe.

i took my car to an exhaust shop and had them weld 3" pipe between the stock downpipe and stock muffler. $150 and sounded amazing, no drone but when you got on it it growled like crazy, it was great.

Only downside is that those exhausts that most shops make (especially for 150) are usually Aluminized steel with crush bends.

I can only speak from the experience that I had with my shop, but it is a road that I would not take again unless I was in a pinch.


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where the fuck do you autocross?

95 db, HA i cant wait to get a screamer pipe

just what i read in the rules online and i dont AX i want to i guess its BS

Hell, pipe is pipe, people can bitch about mandrel bent all they want but im not paying $800 for a catback just because it has someones name stamped on it and it yields barely any more power. Been on the car for over a year and a half now with no creaks leaks or rattles.:headbang:

Well in my case (big turbo and shitty new england road conditions) Aluminized crush bent pipe just wasn't gonna cut it.


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There is no point at all in doing a quiet cat-back because you lose your money, you get no performance and for autox it would hurt you even more because it would take you out of DS (stock class) so now you've modded your car for nothing and gonna have to run a different class against guys with a lot more in there cars. Good thing about the MS3 though for AutoX is that they're a lot of different classes you can enter into when doing even small mods. I ran mine in 4 different classes and won them all.

Actually a catback is permitted in stock class.

Lol... FYI, mandrel isn't a name, is a process of bending pipe

A good muffler shop will have the right equipment, not some crappy muffler shop that specializes in minivan mufflers though.

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Hahahahaha :D Just FYI, mandrel bending exhaust pipe DOES make a huge difference in how free-flowing it is.

Yeah no kidding. The one that I had made for me was made of 3" pipe, but at sharp bends it was like 2". Shit just doesnt cut it.

mods in sig, that dyno was with this exhaust, sorry i'm still not a believer haha. Granted now i've chopped the muffler off and its just a high flow cat and 3" resonator. Id say i'm doing alright, as are the other 4-5 ms3's in my area that liked my exhaust. We are all tuned by the same guy with roughly the same mods making the same power. I seriously doubt the piping goes down to 2", i watched the guys make this and it certainly is not that restricted. If yall really want, ill crawl under the car and snap some pics.

@Voltwings

Pics please. Okthanksbai.

I really have no idea how wide it is/was. I just pulled that number out of my ass.

Im sure that for a stock turbo it flows just fine.

But at the end of the day my mandrel bent SS catback only cost me $330, so its really not that much of a premium (compared to an $800 exhaust).

Right, and i was not arguing that mandrel bent does not yield more power because it obviously does. My point is that it does not yield enough power, on this platform, in this situation to justify the price of an actual catback (cobb, UR, cp-e.....)

Now, i originally tried just measuring with a ruler to show the diameter of the pipe but just the awkward angles under the car were making that difficult. What i did was cut a piece of wire to the OD of the 3" pipe as showed in picture one. I then proceeded to show how much OD was lost in the two main bends, being the two going around the gas tank, by showing the amount of over lap in the wire. Overlap = OD lost during bending, and as you can see about half an inch was lost at each of those two bends, with the shallower bends towards the rear of the car being less. Now we all know that the stock 2.5" piping flows enough for the stock turbo because a full catback will yield just a few horsepower, and i may be eating my words here next week when i go big turbo but right now im hard pressed to say i wasted my money. For the absolute die hards i will even post my dyno sheet to show how power comes on. Again, my point is not that mandrel bent does not yield more power, just that on this platform, in this application it is marginal and my exhaust going to the stock muffler sounded DAMN good, i just wanted it louder.

Sorry for the fuzzy pics, i scratched my phones camera lens a while back, also it seems my dyno pic didnt post and im not going to add another response just for that photo.

@Dr. Speed @voltron

@Voltwings fwiw I just measured mine and the ID of the most pinched section was about 2.6" and your diameter should be around 2.8" based of what you said. So that's not a bad drop in diameter.

@Voltwings
Looks good, nice hands, thanks for pics.

Can I haz?

^^ +1