restrictive exhaust Qs

[veector]

I purchased and installed a giles superpump on my aaz along with a boost controller to get that k14 spinning 18-20lbs on full throttle.  Now i've still got the stock exhaust which was put in recently by the previous owner.  Downpipe, resonator mid muffler and end muffler.  That seems like alot holding back that exhaust pressure...  Would i benefit from deleting a few mufflers or would i need something else?

Thanks,

Vic

[8v-of-fury]

Turbo, resonator, mid muffler and end muffler!? holy cow The turbo itself acts as a huge restriction.

I think if you were to 2.25-2.5" turbo back and just have an end muffler, you would notice a giant increase in performance.

[vanbcguy]

Yeah, even just the weight of the stock exhaust system is a limitation in itself - the "suitcase" resonator under the back seat is pretty heavy and absolutely unnecessary.

I put a Magnaflow cat-back on my gasser, it worked great.  It was a 2.25" though, so I left it on the car when I sold it.  Noticeable difference on the gasser, so I'd imagine the diesel would like it even better!

Does your car not have a cat on it?

[burn_your_money]

If you still have the cat then loosen off the 3 bolts so there is a huge leak there and take it for a spin an see if there is any difference. You should locktight the nuts on so they don't fall off and cause your exhaust to fall.

You'll get the bottom of your car sooty and dirty though.

[veector]

No cat on my car so i think im going to have a straight pipe made from the downpipe and exit in front of the back wheel.  Would i be killing my back pressure by doing that?  Most likely il have something fabbed up with just one end muffler

[burn_your_money]

No back pressure is required since you have a turbo.

Look into upgrading the downpipe (custom) too if the pocket allows.

[veector]

Heh goes to show how much i know so i could run a straight pipe

I've got a good exhaust guy who im sure could fab up a custom downpipe.  What would be a decent size? 2 1/2, 2 3/4? 

[RadoTD]

Heh goes to show how much i know so i could run a straight pipe

I've got a good exhaust guy who im sure could fab up a custom downpipe.  What would be a decent size? 2 1/2, 2 3/4? 

With 20lbs of boost, I'd go at least 2.5".. more likely 3" from the turbo the whole way back

[dyoungen]

Back pressure is nessary on gassers but not Diesels. The better the Diesel breaths, the better she runs.

[veector]

awesome great info guys im sorta new to the diesel world.  Il be looking into a 3" dp then

[veector]

Just spoke to my exhaust guy and he'll be fabbing up a 3" downpipe with flex hose, along with a side exit by the back wheel.  Straight through   Very good pricing too if anyone is looking for an exhaust guy in the west end of Toronto

[MouseGTD]

i made mine myself, only cost me 40 pounds for the piping


i couldn't believe how thin the original down pipe was on mine

standard


after




3" all the way, made a massive difference and makes a great noise when you let off the throttle

[Rabbit on Roids]

i made mine myself, only cost me 40 pounds for the piping


i couldn't believe how thin the original down pipe was on mine

standard


after




3" all the way, made a massive difference and makes a great noise when you let off the throttle

if that thing ^ was on a n/a, you would not have hearing after driving 5 miles. n/a diesels are the LOUDEST thing i have EVER heard in my life.

[MouseGTD]

well it sounds nice on a turbo

[the caveman]

Back pressure is nessary on gassers but not Diesels. The better the Diesel breaths, the better she runs.

But does that apply to non turbo's ?