19 Exhaust silencer(s)

[Neal R19]

Chaps, I'm about to embark on knocking up a side exhaust for my 225 powered 19. The 16V exhaust I've got on it so far has a biggish back box and a smaller one (200mm long) just after the cat converter. Sounds good on an N/A 16v.

My sidey will be 2.5" bore to match my downpipe. The question is - how many silencers do I need to put in it so that it's not obnoxious? Would just the one small box in the same place as the 16v exhaust be enough or do I need two?

 

[Brigsy]

I would go up to 2.75" if you are knocking one up from scratch, 2 silencers will be needed for reasonable noise levels as the small silencers don't do much. Bin the cat it makes a fair difference.

 

[Neal R19]

I would go up to 2.75" if you are knocking one up from scratch, 2 silencers will be needed for reasonable noise levels as the small silencers don't do much. Bin the cat it makes a fair difference.

Cheers, my downpipe is only 2.5" though?

Also I don't have a cat on it, just mentioned that in the context of the 16V exhaust as the 16V has a cat as standard.

 

[Brigsy]

2.5" is a bit small depends how much power you want really - prob ok for 250-270hp. You could just mate a gt turbo tiger sidey to the back of your downpipe they are 2.5" if you are staying with that diameter.

 

[DaveL485]

2 Silencers, for sure!

 

[SPRYBOY]

Could you not get away with one silencer as the turbo makes it less noisy anyway?

 

[andybond]

Single silence will be fine.

I would take note of @Brigsy advice. The 2.5inch will choke the system. You will be looking 280ish tops with that diameter downpipe.

 

[Neal R19]

280ish tops? can't be having that can we!

I dont think I can make the downpipe any bigger as I'm already borderline on master cylinder clearance with the 2.5" and perhaps more importantly, I can't be bothered with the ballache of making another one.

 

[DaveL485]

Amrits car made close to 300hp with a 2.5" system....

 

[andybond]

Amrits car made close to 300hp with a 2.5" system....

On the megane engines on a 2.5 system you wont get more than 280 .

 

[Neal R19]

On the megane engines on a 2.5 system you wont get more than 280 .

You can't go much higher than that without some proper engine mods (rods etc) anyway can you? At the moment I have absolutely no intention of doing any of that but never say never I suppose.

 

[andybond]

You can't go much higher than that without some proper engine mods (rods etc) anyway can you? At the moment I have absolutely no intention of doing any of that but never say never I suppose.

Rods are good for 300ibft