Which Exhaust ?

[C J R]

Hi,
I need to change my exhaust.
 
Current set up, Dragon cat bypass pipe to a Hyper SR back box. Full system is 75mm Diameter with 120mm diameter outlet on the back box.
 
Engine is mapped to 540bhp. Advised I should stick to 75mm diameter main pipe size.
 
I have read threads on here that certain exhausts are too loud.
 
I am considering the 5Zigen ProRace.
 
Which exhausts are suitable for the RX and which would you recommend ?
 
Thanks
Chris

[karl_tate]

didnt realise your car was putting out that much power mate

i dont quite understand what your saying though, currently 75mm but advised 75mm :confused:

[shaunwil]

Always a hard thing to say. The mid-pipe silencer made a difference but has taken away too much power. I wouldn\'t go with anything less than 75mm or you won\'t see the same amount of power. I\'m running a 3in setup with the smaller turbo

Shaun

[C J R]

didnt realise your car was putting out that much power mate
 
i dont quite understand what your saying though, currently 75mm but advised 75mm :confused:

Sorry, I should have clarified.
 
The main exhaust pipe diameter is 75mm thru\' to the rear silencer.
I have been advise that for the bhp of the engine I can use a replacement exhaust with 75mm pipe, I do not have to upgrade to 90mm.
 
Chris

[shaunwil]

My backbox is a 5Zigen but not sure which one !

Shaun

[C J R]

My backbox is a 5Zigen but not sure which one !
 
Shaun

 
Shaun,
Yours is louder than mine !!
I have read that the Blitz Nurspec are loud and some of the Kakimoto (spelling may be incorrect).
 
I was hoping the 5Zigen might not be (too) loud.
 
Chris

[shaunwil]

Its quieter now with the silencer from WGT. But its 60mm diameter and killing the power and boost level. Thinking of making my own mid-pipe silencer and doing some experiments.

Do you have a silencer in the middle at the minute though. The last time you saw my car it was 3in straight through

Shaun

[C J R]

No mid silencer, just 75mm straight thru\' from the turbo to the back box.
 
Does your 5Zigen have a slash cut end ?
 
Chris

[najiru]

Having spoken to Martin the 5Zigen pro racer has a 65mm pipe up to the first silencer then it opens out. I was after it till I found this out

[jm-garage.co.uk]

The 5zigens tend to be quite loud. Kakimoto more so unless you get the dual silenced versions.
 
Are you looking to keep the "jap" look rear muffler or are you open to more subtle styles?

[Mazdarotaryparts]

We sell 5Zigen and yes they are loud but more than that I would advise being cautious  because if you fit an exhaust that flows more freely that the exhaust you were mapped with you may risk boost spikes which is not good and potentialy life threatening

[shaunwil]

No mid silencer, just 75mm straight thru\' from the turbo to the back box.
 
Does your 5Zigen have a slash cut end ?
 
Chris

No, just a straight cut !

Shaun

[C J R]

Thanks for your replies.
 
I would prefer to keep the Jap style.
 
Thanks for the news on the 5Zigen pro race being 65mm up to the first silencer (I too was looking at the one Martin has).
 
Clive -  Good point about mapping, I have discussed this with Pip and we agree that (depending on the type of exhaust selected) it would be benificial to have a run on the rolling road to check the map is still okay for the new exhaust.
 
I\'ll keep looking.
 
Thanks
Chris

[Speedworks]

maybe something custom made in double 60mm tubing from DP to rear catback?

Double 60mm gives you mroe flow than a single 75mm and lower sound level (deeper) as smaller tubing results in a shorter resonance wave and thus lower noise level.

[gregmacd]

I have a Kakimoto 92db:



It is 75mm straight through (with a silencer and silenced back box) It\'s very quiet on idle and at low revs but makes a very angry bark (I think it sounds like an old 70s muscle drag car) when under load. I have nowhere near as much power as you so I have no idea how suitable it might be. I can tell you that no-one who has heard it (other than me :rolleyes:) likes the sound of it.