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Discussion Starter #1 (Edited)
Just need a little advice as I need a new exhaust.

I currently have a hks hyper that needs replacing, the bore measures 12" around on the current one and don't know which others are the same size.

I have the option of:

Hks hi power silent
Hks hi power 409
Blitz nur spec r
Jap speed ones or othe random cheap makes

What would you suggest and will the diameter make any difference?

I have used the search but not getting much use out of it

Cheers
 

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i think the first 3 exhausts you've listed can flow atleast 600bhp but don't quote me on that,the Japspeed i'm not sure about,but they all sound different so i guess it comes down to what you want noise wise?

And what kind of power are you running now,the biggest factor i guess could be the internal pipe diameter depending on power?
 

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just an FYI, the internal diameter of the hks hipower is about 3.125", which is on the small side. also, its 15" long plus the tip and 22" around. mine is rusted on the inside and so is the weld at the inlet and outlet.

consider going custom and replacing the rear flange with a v-band for easy installation and removal. consider using magnaflow race series, dynomax ultra flo, or vibrant for mufflers.
 
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