Blitz nur-spec r

Hi,

Exhaust wise I've currently got a blitz nur-spec r and a milltek de-cat down pipe.

The down pipe is 3" all the way and I believe the nur-spec is 3" but reduces to 2.5" where it joins the down pipe.

I've taken a couple of pics of where the 2 join.





Would I just need to get that one small bit changed and would it be worth my while to have the nur-spec altered to 3" all the way through?

Logically, having a 2.5" section would mean that the whole system is in effect only a 2.5" not a 3"?

Next question is where would be the best place to get it done and how much approx would it be?

Any thoughts?

Cheers Paul

Not sure if that would make any difference TBH Paul. Sure Jonny or Andy K will shed some light.

It was after I read this that made me think about it.

http://bbs.scoobynet.com/general-technical-10/851519-blitz-nur-spec-r-question.html

Paul, from an hydraulic point of view it would make a big diference as your creating a throttle within the system by reducing the pipe size to 2.5".

By reducing the pipe size you are creating a backward flow in the pipes as the 2.5" pipe cannot flow the same amount as a 3" pipe.

I know when I was running a sports cat on mine this was doing a similar thing reducing the air flow, thus causing back pressure within the front system. I gain about 30hp when I removed it from my system and put a small silencer in its place.

Cheers , I'm deffo going to get it done now, before I get the map tweeked for the other stuff too.

Where would I be able to get this done ?

wrxsti350 wrote:

Cheers , I'm deffo going to get it done now, before I get the map tweeked for the other stuff too.

Where would I be able to get this done ?

Try Drew, he has had alot of pipework done lately, he might know someone.

if u have the 2 flanges i can do it , u cn buy the flanges at revolution

colmoo wrote:

if u have the 2 flanges i can do it , u cn buy the flanges at revolution

Would I not just need one 3" flange for the blitz end? as the down pipe is already 3".

didnt know you could weld col nice to know mate

i am a man of many talents , use to make one off exhausts for another company kgt uses in spenny back in the day lol , ps yes mate sorry u may only need one , but problem is is the front flange totaly flat ,if not u will need 2x flanges and a gasket while u are there

Not sure if it's totally flat? Could just get 2 flanges and take one back if it's not needed.

I'll get back to you once I've been to revolution.

Cheers Paul

ok mate

It would be an advantage to replace the 2.5" part with a 3" if you are going over 380hp, under that and a 2.5 system will flow enough gas, remember though that joint is also a flexing point on the exhaust.

I did exactly the same job on my first Subaru when planning on going over 400hp, I fitted a flexi joint though, this made the system 2 piece though!

This is what I used- http://www.pacesetterexhaust.com/perf_exhaust.htm

It was the- 82-4218

Cheers for the info Jonny.

I like the idear of a flexi joint.

This is the one I'm thinking of ordering : https://www.jetex.co.uk/jetex/store/index.php?_a=viewProd&productId=2971&added=1

Don't know much about welding, would a mild steel weld be strong enough or would it need to be a stainless weld? Colmoo said he could do a mild steel one.