View Poll Results: Would you mix exhaust and decat bore sizes?

Yes, it's fine and you will see performance increase

No, you can't mix sizes because...

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There will be no performance increase, just more noise

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70mm Decat with Japspeed Exhaust

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May 3, 2015 | 06:15 AM

N777CK T

Thread Starter

Joined: Feb 2012

Posts: 176

Likes: 5

From: England

70mm Decat with Japspeed Exhaust

Hi all,

I'm running this Japspeed cat back exhaust system which has 2.25" bore with twin 4" slashed tailpipes which I won on eBay brand new for a steal at £120.

Japspeed Catback Link:
http://www.japspeed.co.uk/honda-s200...st-system.html

I have been offered a Skunk2 70mm decat pipe for a decent price.

Skunk2 Decat Link:
http://www.tegiwaimports.com/skunk2-...nda-s2000.html

Japspeed sell their own 2.25" (57mm) bore inlet, 2.5" (63.5mm) bore outlet decat pipe on their site.

http://www.japspeed.co.uk/honda-s2000-decat-pipe.html

Is it ok, good or bad to run a 70mm (2.75") decat with my 2.25" (57mm) exhaust?