Quiet turbo exhaust ideas

[Simple_Smith]

Alright so i've been thinking for a long time about bosting my e30 and i have been tossing exhaust ideas around in my head for a while

Still not sure exactly what i'm doing for the turbo side of things; more than likely a HX35 with a budget friendly build. nothing too crazy

First things first, i have a theory i'd like to run by you turbo guys out there:
Will using an RPM activated exhaust cutout cause any unwanted problems for the turbo or tuning? I was thinking of having it set around 3000rpm so i will be able to cruise and idle nice and quietly like a snake in the grass hehe. but really, i'd like to keep the fact that i'm boosted as concealed as possible so i can fit in in traffic and don't put a target on myself.

Idea 1: 3" downpipe to cutout, resonator, 2.5" Borla dual in/out and loop it through like a Mugen twin loop with a turndown (will be cutting the tire well as to mount the muffler sideways for space)



Idea 2: 3" downpipe to cutout, magnaflow 3" in/dual 2.5 out to the same borla and just straight through to turndowns.

Any thoughts and feedback would be greatly appreciated.
Thanks,
Corey

[Dj Buttchug]

you dont need any of that cutout nonsense or a resonator. Run a full 3 inch to a big muffler. Turbos quite exhaust from the start.

[ak-]

The turbo exhaust housing itself is a muffler. Just find a huge muffler or 2 regular size ones and it will be quiet.

Electric cut out if you want.

[einstein57]

I'd have the cutout TPS based instead of RPM if it were my car. I've only had experience with one manual switch cutout and it moved very slow. It took several seconds to open up completely. I assume it was so you could dial in how loud you wanted it easily.

[Simple_Smith]

Thanks for the responses guys.
I might just go with a single 3" back to a twin looped borla cuz i'm really interested in how that would actually sound. The main reason for the cutout was to cut down on any back pressure when getting into boost. I'm still a turbo n00b and haven't owned a turbo car so thanks for bearing with me.

Einstein, you're saying a WOT switch correct?

[ak-]

That twin loop thing looks like it's going to be loud and a butt plug

[Dj Buttchug]

That twin loop thing looks like it's going to be loud and a butt plug

they are loud. at least on NA cars. Go with a straight regular style muffler. youll be much happy you did. trust me.

stay safe op. learn about le boost first

[Simple_Smith]

they are loud. at least on NA cars. Go with a straight regular style muffler. youll be much happy you did. trust me.

stay safe op. learn about le boost first

But i will forever live in regret not knowing how it would've sounded haha. Seriously though, I will take your advice. 3" to Muffler. simple enough.

I am learning, slowly. reading build threads here and on e30tech mostly. I'm trying to find the balance for me between quality parts and budget.
So far (keep in mind its an ongoing and changing list)

ARP studs
OEM Headgasket
Planning on having the water jackets on the head welded
Not sure if i should go O-ring right away or wait on that
Holset HX35
#42 injectors
Walbro 255
ebay intercooler and piping
Greddy type rs bov
Megasquirt 1
LC-1 Wideband
cooler plugs
turbo feed and drain lines
and MISC MISC MISC