Performance exhaust benefits

[V70 Graham]

I've been thinking (and yes it hurt) what are the benifits of performance exhaust/dp's ?

Now lets say my car is putting out around 270-280bhp and the list of mods is RICA 310 map, improved intake pipework, cone filter and (if I can get it out of the box) a performance intercooler.

Am I correct in thinking that a cat back would simply 'look good' and 'sound better' ?

I guess a performance downpipe would aid the release of exhaust gasses and maybe spool up the turbo a little quicker, but would it equate to more bhp ?

Comments, suggestions and slating welcomed.....

[T5RatherAmusin]

your pretty much bang on tbh. downpipe will help resposivness and spool quicker. not so much add hp but as said boost will be there faster.
catback just for the burbly goodness

no slating needed get them fitted you tool

[Santa]

Race cat or cat removal to add to your exhaust and DP

[V70 Graham]

Race cat or cat removal to add to your exhaust and DP

Would removal not throw up a dash light.....or fail the MOT ?

[Harvey]

No I mustn't look at this thread,must say I am going to change the exhaust cat back on the V70 should be fun if it changes much,I know it sound great when you put your foot down.

[Jamest5r]

Would removal not throw up a dash light.....or fail the MOT ?

Nope, dont think so but yours being me7 anything can happen, im running a 100 cel cat on the v70 without probs.

[graemewelch]

think of it this way. youve got a straw that your sucking your coca cola out of. if its kinked youve got to work harder to get it out of the glass, removing that kink makes it so much easier. its the same for a exhaust. i hope that makes sense. a down pipe and straight through exhaust will get the gases out faster and that means more cold air into the cylinder. without doubt youll gain both torque and bhp from fitting a free flowing system.

[Jamest5r]

think of it this way. youve got a straw that your sucking your coca cola out of. if its kinked youve got to work harder to get it out of the glass, removing that kink makes it so much easier. its the same for a exhaust. i hope that makes sense. a down pipe and straight through exhaust will get the gases out faster and that means more cold air into the cylinder. without doubt youll gain both torque and bhp from fitting a free flowing system.

But Graham need's to keep it legal with no probs come mot time so play safe with a 200 cell.

[graemewelch]

200 cell with out a doubt. the gains will still be very good and will compliment the rest of his mods

[Harvey]

200 cell with out a doubt. the gains will still be very good and will compliment the rest of his mods

Just to ask what are the numbers compared to the factory one at mot time,just how close is it ?.

Regarding the readings on the emmisions side of things,with a 200 cell cat that you are making ?.

[V70 Graham]

Just to ask what are the numbers compared to the factory one at mot time,just how close is it ?.

I think they go from 100-400 from what I've read

[Nealevo]

I gained a massive 2 bhp with my cat back, you wont notice it on the road but it sounds much better, with my DP and race cat it is now a little to loud (im getting old).

[Jamest5r]

Ive had no probs with a 100 cell on a v70 non me7 ill dig out the mot tomorrow and post the pic of the figs

[stribo]

So it's a performance exhaust now is it, what's next, bigger turbo, water injection?

[graemewelch]

Just to ask what are the numbers compared to the factory one at mot time,just how close is it ?.

Regarding the readings on the emmisions side of things,with a 200 cell cat that you are making ?.

200 cell will fly through a mot. aslong as your car is healthy which i know it is.

Ive had no probs with a 100 cell on a v70 non me7 ill dig out the mot tomorrow and post the pic of the figs

ive also got 100 cell and had no issues with mots

[V70 Graham]

So it's a performance exhaust now is it, what's next, bigger turbo, water injection?

Getting worried my slim friend ?

[merc85]

Removal of a cat can add upto 10% to the vehicles power.

[stribo]

Getting worried my slim friend ?

I've got nothing to be worried about, your car's nowhere near mine on the strip.

[T5frankie]

Removal of a cat can add upto 10% to the vehicles power.

when i de-catted mine it took 4/10ths off my 1/4 mile

[graemewelch]

when i de-catted mine it took 4/10ths off my 1/4 mile

thatl be the wieght reduction. those cat wiegh a ton.