Exhaust size?

[R3H4N]

Was looking around on here but couldnt find what i was looking for maybe iv missed it..i was thinking of getting a back box for the k11 though id go with the 3" rolled tip cherry bomb..so seeing as it'l be on the ramp getting the back box welded on i thought i could change the complete system while at it..so just wanted to know what would be the best size is for the system

 

[Enuo]

Depends, what performance mods are you planning on doing? Unless you're fitting a 4 branch manifold, cai, maybe even cams I doubt you'll notice gains from a bigger exhaust... the larger the diameter the higher up the range you get optimal flow rate.

 

[R3H4N]

Depends, what performance mods are you planning on doing? Unless you're fitting a 4 branch manifold, cai, maybe even cams I doubt you'll notice gains from a bigger exhaust... the larger the diameter the higher up the range you get optimal flow rate.

tbh i just want it to be a little more free,i dont want it holding back and yep will be going with a 4branch mani,decat,induction kit for now..

reason im saying i dont want it holding back is my civic used to hold back to until i replaced the stock exhaust system to a 2.25" obviously didnt go super fast but it felt alot more free..

 

[Huggy444]

tbh i just want it to be a little more free,i dont want it holding back and yep will be going with a 4branch mani,decat,induction kit for now..

reason im saying i dont want it holding back is my civic used to hold back to until i replaced the stock exhaust system to a 2.25" obviously didnt go super fast but it felt alot more free..

The sportex/Peter Lloyd exhaust is a 2.25"...it's a competition exhaust system so I reckon 3" would be absolute tops for power gain.

 

[Huggy444]

tbh i just want it to be a little more free,i dont want it holding back and yep will be going with a 4branch mani,decat,induction kit for now..

reason im saying i dont want it holding back is my civic used to hold back to until i replaced the stock exhaust system to a 2.25" obviously didnt go super fast but it felt alot more free..

The sportex/Peter Lloyd exhaust is a 2.25"...it's a competition exhaust system so I reckon 3" would be absolute tops for power gain.

 

[Enuo]

The sportex/Peter Lloyd exhaust is a 2.25"...it's a competition exhaust system so I reckon 3" would be absolute tops for power gain.

I don't think a CG would need a 3"... not unless it was turbo'd.

 

[frank]

the lloyd system is 40mm o/d iirc (1.5"), and the size of the 4-2-1 would dictate what bore to go for really

 

[Enuo]

stock is 40mm Frank

 

[R3H4N]

so the 1 litre comes with 1.5" as stock? so should i go for a 2.25" ?

 

[Enuo]

The 1.0 and 1.3 come with same exhaust. I wouldn't go over 2", 1.75" for town/city driving and go from there, 2.25" seems WAY ott for me. No point going bigger than the tubing in the 4 branch though.

 

[frank]

stock is 40mm Frank

nah, stock is 38mm o/d and 35 i/d (swaged down to 32mm in places, ie, crush-bent) the lloyd system is only 3mm bigger bore iirc