Thread: New catback + self activated cutout experiment

Hey guys,

I'm planning to install a cutout and I was thinking about doing the following, install a solenoid and activate it at a given RPM from an ECU signal (My ECU activates intake and exhaust separately, so I could just wire both cams to one signal and use the second one for the cutout).

So for example, when accelerating it would be quiet until 4000 RPM when the cutout activates and then at 4600 VVL would also activate.

I would also add a switch to enable/disable the cutout feature.

The idea is to retain a quiet car (is my daily driver) and still get all the VVL fun when fooling around or at the track + not loosing low rpm torque.

I currently have the stock catback (2.25" I think) with a Fujitsubo high flow exhaust, and I like how quiet it is when I'm not flooring it.

So my questions are,

Should I go 2.5" or 3" for this experiment (loudness vs additional performance)?

Do you think I would get positive results? Would you do anything different?

Well if you really want to compromise between sound level and HP I'd get a 2.5" -OR get a 3" with your cat intact, with a Dynoxmax drone-free muffler. They are about $75 and pretty quiet. I have one on my B14 DE.

I do have a 3" exhaust on my VE, magnaflow muffler, with no cat and it's pretty darn loud and annoying but it's not my DD, so its not a biggie for me.

i have 3" mandrel with straight thru 3" magnaflow reso and 3" dynomax round muffler. loud when you open it up but not so bad

i thought of putting on a 2.25" resonator and 2.25" muffler and leave the piping as 3". should be quieter seeing i would be still getting 2.25" flow

and add an exhaust cut-out after the header. i would use a switch to activate it rather than using rpm though. cause there would be times when [like on the hw], i would want to open her up without she being loud. would using the switch to activate as needed such as when racing

if i were you i would use 2.25" piping AFTER the cut out with 2.25" muffler and 2.25" reso. then run a bit of 3" from header to where you would install the cut out. you could use the rpm switch [auto] or manual switch it o activate the cut out

whatever you do, let us know and provide vids please

peace

I used to have a cut out but i must tell you, opening it with RPMS its a issue because the electric cut outs does not open very quick i think you should use a switch and if you need to race you just open it and close it when you want...

Also in a VE a cut out sounds extremly loud i couldnt even hear my thoughts.... hahaha

i did a set up similar to that with a solenoid hooked up to my cut out. i wanted to experiment with hooking up a wastegate with a low psi spring so it would get rid of back pressure at higher rpm. or just say fuck it and go 3 inch... lol

I like that, great idea.



I'm not using those ebay cutouts, it's supposed to open instantly with the setup I'm looking at. And not hearing my thoughts sound like a good idea to me hahahahha

np

i am thinking the 2.25" should not stifle the motor while at the same time [if you get the proper muffler and reso], it should be quiet enough for dd

peace

Thanks Nizmo

So it would be something like this,



(no, it wasn't made by my 6 year old brother)

Sounds like a lot of work.... but if you got the time and money go for it.