3" Or 3.5" Exhaust

[kingtube69]

I took that a looong time ago. It's a "90 mm" kakimoto.

90 mm, yeah right. +1 for Jap Junk!

Fuaaarrrkk what a shitheap of an exhaust

[Ke55pig]

Well its 3" hole way through cannon and i cant c through the centre one as of bends

[Ke55pig]

So my guess is its probaly in the centre resonator bit or it doesnt actually go gay at all and my cooler is restriction

[Ben C34]

Stop guessing.

Buy an inspection camera on ebay for 15 bucks and have a look.

[Rbdirty30]

This is my exforce exhaust for my 32, it's 3.5 inch except for the rear muffler witch starts off at 3inch from the flange. [emoji107]

[R31Nismoid]

So my guess is its probaly in the centre resonator bit or it doesnt actually go gay at all and my cooler is restriction

Have a good look just before/after resonators/mufflers. Usually it's given away by a small reduction in the outside pipe diameter, it drops down just a bit.

Not always the case but the vast majority of (quiet) Jap exhausts I've seen have it done this way if you cannot see the obvious one from the rear end.

Pretty easy to confirm restriction on dyno anyway, just drop the exhaust post-dump, see what happens

[Ke55pig]

Yea rear cannons deffiently staraight through.Theres no drop in the pipe size but could still have some thing in the centre res.Im just going to leave it and find a 3.5-4" exhaust for it for events and put the blitz back on for the st.

Tune with track exhaust and let it be restricted on the st

[Nick_GTR]

I wish this had been discussed a couple of months ago. I recently bought a Kakimoto Hyper Full Mega N1, supposedly 90mm throughout. Upon inspection when it arrived, it was stepped down going into the centre muffler, yet maintained the 90mm external dimensions. Fitted the exhaust anyway and even without dyno results, I can tell you that performance has been choked up. The turbos aren't spooling as quickly and I'm not nearly making as much power. Very disappointing

[Ke55pig]

It is verry dissapointing a big well made jap exhaust has these restrictions i noticed mine with the fact i made 350 on 98 changed to e85 and changed exhaust and still made 350 up top

Dyno shows this fingers crossed it was the change of exhaust that caused it

Edited January 9, 2016 by Ke55pig

[kingtube69]

It is verry dissapointing a big well made jap exhaust has these restrictions i noticed mine with the fact i made 350 on 98 changed to e85 and changed exhaust and still made 350 up top

Dyno shows this fingers crossed it was the change of exhaust that caused it

Thats unfortunate - Could you possibly go back and get them to drop the exhaust then rerun on the dyno to see if thats the restriction?

[Ke55pig]

It is going back on dyno soon so will c how much difference it makes would like to thing 30kw more