K03s.. required exhaust bore? is it an issue?

[nick s]

hi guys,

i can't seem to find any threads that discuss the optimum exhaust bore? i spoke to jabba and they said a 2.5" downpipe and exhaust with a 2.5" bore right the way through will be sufficient for a K03s ibiza? anyone got any experience with this? what bore is everyone else running (downpipe & rest of exhaust) i don't want to go buying something restricitve. at the moment i have a powerflow cat back that came with the car. so if it's 2.5" bore and that is sufficient, there is no poit in me wasting money on a full blueflame? i may aswell just get the downpipe and cat?? thanks guys.

 

[Tha Spank]

2,5” DP is more than enough, it's even overkill. If you want you
can keep the rest 2".

 

[Havok316]

2,5” DP is more than enough, it's even overkill. If you want you
can keep the rest 2".

so is that the standard bore size?

 

[nick s]

brilliant that's what i'm after, so a 2.5" downpipe and exhaust is perfect for a K03s conversion? i wouldn't see any more benefits from getting a 3" downpipe?

 

[karl.w]

3" d/p and 2.5" the rest of the way back works well for me

 

[nick s]

but will a 2.5 " work just aswell seeing as the K03s is still essentially a small turbo? does it actually require 3" to get the best from it or are jabba right?

 

[Cupra_Wayne]

I have a 3" DP but Jabbas rep speaks for itself. Try and find a 2.75" lol!

 

[gazcuprablk]

3" dp+race cat and 2 1/2 cat back works for me to

 

[Tha Spank]

so is that the standard bore size?

yes it's 54mm = 2,13 inch.

This wouldn't be a restriction for the k03s.
The 2,5 " DP is to get the presure after the
turbo as low as possible. Source is Revo
Netherlands.

I've got a 3" myself but I'm going for a gtrs.
2,5" end is the biggest our ibi's can have
because of the brake lines on the back.
(maybe you don't have this problem with
a right stearing car)

 

[PhilW]

2.5 inch is fine. Only would need to go to 3" for more than 270-280bhp i reckon.

 

[nick s]

flash - you think a 3" would be more beneficial?

 

[Havok316]

so its that a 3" downpipe to back box? sorry i know its probably a noob question lol.

so far it sounds like u guys are saying 3" down pipe into a cat then 2.5" to the back box?

 

[nick s]

do blueflame still do a full system including 3" downpipe?

 

[PhilW]

Read whats written above. Flashbsd said to look at a Blueflame downpipe.

 

[nick s]

i did read that. it's just that some people have said they don't do a 3" anymore.

 

[nick s]

just spoke to blueflame and they do a 2.75" downpipe off the shelf with the rest of the system 2.5" £540. gonna order that in a bit when i get a chance.

 

[Essex_Cupra]

I prefered my standard dp than to the Miltek dp & Race cat!

 

[nick s]

I prefered my standard dp than to the Miltek dp & Race cat!

really? why was that?

i just rang jabba again, and they said 2.75" downpipe on a KO3s is fine, even 2.5" is perfect. he said ave my money and go for the 2.75" as he can guarantee the 3" won't give any more gains. elton was his name i think?!

 

[CatB1]

Milltek downpipe, cat & exhaust(ko3s)on mine.Gave 249bhp & 262lb/ft when mapped at Jabba.

 

[nick s]

Milltek downpipe, cat & exhaust(ko3s)on mine.Gave 249bhp & 262lb/ft when mapped at Jabba.

nice result! that's about what i'm looking for. what inch is your downpipe?