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Well i have room for a 4" dump but i think that could be over kill.

My exhaust is only a 3" blitz nur spec type r.

So it will have a step wen it goes into that but if that's not a issue i will opt to go bigger then 3 to allow for future mods

The difference in this dyno sheet is e85 and changing my exhaust from a straight through 3" with twin rear pipes to the nur spec type r so i do beleive that the sytem is restrictive most likely the rear cannon section

post-77561-0-02271300-1448565663_thumb.jpeg

Wmdc35 is that exhaust or dump ?

I dont beleive my dump is a restriction but i think 3.5 would be better but i do think my exhaust is a restriction.

I will drop the exhaust next time its on dyno see if i gain all that power up top somethings restricting that.

How do you know if an exhaust is a restriction? Unless you can somehow drop the dump at the turbo flange... otherwise the dump might be the restriction.

Bigger and straighter it is the better usually. Larger diameter at the dump and dropping half an inch around where the cat usually sits seems to work well for me, with the least bending possible.

Yea thats a good point i dont no if the exhaust is the restriction but as u can see on the dyno it dives across and masde the same it did on 98 up top makeing me think its the exhaust as thats what got change with the tune.

It only has a centre round hotdog muffler thing rear muffler/cannon seems to hold 3" through it.

So it is ok to have a stepp in the pipeing doesnt cause funny flow

  • 2 weeks later...

So i spoke to the guy who does my fab he would prefer to do it in 4" instead of 3.5 is there any downsides to this ??. And do i just let it step from 4 to 3 at exhaust or ramp it down vefore itbhits the exhaust. ????

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