Whos Jammed A 3inch Pipe Straight Through There Gutted Cat?

[Cubes]

A straight through pipe doesn't really make it that much louder now drone in the cabin (unless the exhaust is prone to do so anyway) just a tad deeper and gruntier sounding.

A well setup exhaust shouldn't drone in the cabin full stop.

[shonen]

A straight through pipe doesn't really make it that much louder now drone in the cabin (unless the exhaust is prone to do so anyway) just a tad deeper and gruntier sounding.

A well setup exhaust shouldn't drone in the cabin full stop.

agreed...my exhuast is pretty much a straight pipe from the cat back and it IS loud...but not drony and more than bearable on idle and low revs.

[Sumo]

Bear in mind one of the most restrictions in an exhaust is the catalytic converter aka cat!!!

I would nearly put my money on a turbo being a bigger restriction.

Cheers

Sumo

[WazR32GTSt]

How about you just do the right thing and buy a new cat...

Think of the environment.

Think of the cancer growing in your lungs from breathing in your un-catalysed exhaust gasses.

Is it worth it all just for gaining a few kW?

those kind of emmissions won't cause lung cancer... not in short-term exposure anyway

lung disease, yes (eg lung fibrosis)

you'd have to be breathing in funes everyday for years to be at risk there

honestly, i did this to my car before i got a high-flow cat and i noticed no increase in exhaust note, and no difference in power at all!

so it begs the question, why bother?

[mr_rbman]

A straight through pipe doesn't really make it that much louder now drone in the cabin (unless the exhaust is prone to do so anyway) just a tad deeper and gruntier sounding.

A well setup exhaust shouldn't drone in the cabin full stop.

mine mustn't be setup too well then. hehe!

[Cubes]

lol yours is insane...

Throw a center resonator in the middle and it should shut it up a little.

I'll soon be throwing a center muffler in. Hopefully shuts it up a touch.

[BAMR33]

Going back to the original question why would you go to all the effort of putting a straight pipe through the cat? its pointless, if a cop pulls you over its usually due to the smell or noise and then they'll send you to the transport department. There are performance gains from a straight through pipe, but its not worth it on your daily driver.

[letemlaf]

My car has a decent high flow cat but since i installed a power fc and had it tuned it is running quiet rich and i always get pops through my exhaust, sometimes very loud ones. will this destroy my cat pretty quickly?

[fEkuaR]

i have a 3" pipe inside my cat, quite a noticeable difference in both noise and performance, definitely do it!

whats ya number plate

[mr_rbman]

if u get told to go to the transport authority just replace it with a hi flo cat, its not rocket science!

[johnGTS-t]

yeh they might look like a cat but if ya blowing flames out the exhaust they might be a bit suss about that

ive have a stock r32 im running on the track. ive gutted the cat and taken the rear muffler off. will i blow flames?? if so, cool!!!

and will i notice much difference without it? i havent tried it yet, have to wait till next weekend.

i will have a 3'' system on it by feb next year but for now its honkin ok.

Edited November 23, 2006 by johnGTS-t

[SKY 34]

get a small body 3" cat..abt $160+ then shove the pipe thru...otherwise the smaller size of stock cat will restrict flow...no point

[NickR33]

there is almost no difference between a 'highflow' cat and a straight through pipe in terms of performance...

I know because the 2 bolts holding my cat to the front pipe came out last week and I was driving around for a few days with no muffling of any kind... the noise was deafening and sounded like crap below 3000rpm... I was even turning the ignition off at light because I was so ashamed...

now its fixed the performance difference is hardly noticable and that is with a cat, resonator and muffler bolted back on... so just get a proper cat and do everyone a favour

[johnGTS-t]

i wont be running a cat of any sort. its a race car

[-_-StRyDeR-_-]

kinda sounds like you were going to gut your cat no matter what these guys have said? :S

the gutted cats iv heard sound hollow n a bad sound as if they have big exhuast leaks...

CJ

ps, i must be a lazy cu*t, i sit in maccas drivethrough for 1hr!! (yeh right)

Ive got a black car so it won't look that different. It will fit you just have to cut the cat housing a bit. As for cancer and contributing to the death of the environment.. you guys are funny.

I think it evens out for me acually, i ride to work and catch the train to uni so i only drive my rig on the weekends which is alot better for the environment. The lazy cu*ts who drive everywhere and would rather sit for 1hr in macas drive through than walk into the place and be in and out in 5 mins are the ones you guys should be angry at.

cheers.

[685]

thats why you dont gutter em, get 3" straight pipe made up..only costs like 50bux if that, and u get lotza grunt.

noticed bit of power gain, but not worth for the 10k fine frm epa

my 2 cents