decat - Saxperience

355858 · 2nd April 2007, 18:36

does anyone know if a decat pipe will fit onto a standard exhaust or if it will only go onto aftermarket also does it need to be welded on? cos i wanna be able to swap it over for MOT? is it easy to put on and take off?

Sorry bout all the questions

Japman · 2nd April 2007, 18:39

It should fit on mate,but id wait until after the mot if its soon

355858 · 2nd April 2007, 18:40

its 11 months off

Toad · 2nd April 2007, 18:42

Don't de-cat your standard exhaust. You're best purchasing a new system, with a decat pipe, and when MOT time comes, get the old exhaust system back on. It's not a big job that way.

S34MER · 2nd April 2007, 18:47

its a piss easy job to swap the cat over come MOT time anyway, 10-15min job!

bear_westy · 2nd April 2007, 18:51

toad dunno what youre on like, glue? swapping a whole system takes way longer than a de-cat pipe.... it is only 2 bolts to the manifold and an exhaust clamp to the centre section undo them then hit it with a rubber mallet a couple of times and put the cat back on exactly the same way but in reverse.

Toad · 2nd April 2007, 19:00

LOL. I meant in reference to putting a de-cat on the standard exhaust. I wasn't trying to compare the difference between swapping the de-cat pipe out Vs putting in another system. At the end of the day, it's a bit pointless removing the cat from the standard system. There's a lot of restriction there, best get a decent system IMO.

355858 · 2nd April 2007, 19:01

can u get a decent counding and good performing cat back system? atleast that way it will save me the bother of the changing it all about?

Toad · 2nd April 2007, 19:24

Well, yes, as most of the systems are 'cat back' systems. The cat bypass pipe is an addition if you know what i mean.

355858 · 2nd April 2007, 22:33

oh ok so i could get one then take the cat out if i wanted to?

Toad · 2nd April 2007, 22:54

If you like... But if you are looking for out and out performance, you'll need the cat removed, and a proper cat bypass pipe. The standard downpipe that has the cat on it, is shocking. Then again, are you running a VTR? It's probably not worth thinking so much in terms of power in that case, I would just go with the cat back system. I will sound nice and look good, but don't expect any real gains in power.

S34MER · 2nd April 2007, 22:56

Quote:

Originally Posted by 355858

oh ok so i could get one then take the cat out if i wanted to?

yup sure could!

S34MER · 2nd April 2007, 22:59

Quote:

Originally Posted by Toad

If you like... But if you are looking for out and out performance, you'll need the cat removed, and a proper cat bypass pipe. The standard downpipe that has the cat on it, is shocking. Then again, are you running a VTR? It's probably not worth thinking so much in terms of power in that case, I would just go with the cat back system. I will sound nice and look good, but don't expect any real gains in power.

he'll still see an increase in performance as the fuems will exit quicker, and a decat pipe will make it alot more responsive!

Toad · 2nd April 2007, 23:08

Sort of, but there's other factors to consider. Tuning cars is never straight forward, you can't just somtimes make one mod, and expect to see great things. The exhaust works well if there's potential to NEED to get the exhaust gases out quicker. I.e., you will need to think about getting more air in also. So there's induction to consider, and also the exhaust manifold, which is almost like a cork between the two. I didn't say that he wouldn't gain power, I said not to expect much.

S34MER · 2nd April 2007, 23:11

yeah i quite agree, but you've got to start somewhere!

Toad · 3rd April 2007, 07:57

Agreed.