Stuno1

You guys have a lot more mods and experience with mods for an isf than we have in the uk.

My isf has a takeda intake and an exhaust system that removed the second cat. There is one pipe per back box going in to the pre cats as per clip below. I know these engines are hard to get big gains from as they are n/a but wondered what I should be expecting power wise?

The mods were done for sound not power but still interested.


Stu

Defratos

Well since you've already done something to the exhaust I'd say the best other part you can install would be headers.

Either PPE or Sikky Headers.

I personally still have the stock exhaust on mine but installed PPE Headers, that gave me a decent amount of power.

On the ISF it's usually just Exhaust and headers, if you really want to then maybe filters.

BTW nice choice on the ISF, I rarely see them in the UK when I used to live there or when I go back on holiday. Such a rare car over there.

Stuno1

Yup, only 200 ish in the country!!! Exclusivity is great.

I'll stick it on a dyno soon. Just interested to see what others with similar mods have achieved.

Stu

ToothDoc

Here's my opinions... primary cats - 20hp, secondary cats 15hp. Less restrictive exhaust piping/mufflers 10hp. I think there is about 40-50hp bottled up in the exhaust/emissions.

I'd say you're at 15 or so more crank hp.

Stuno1

Ill stick it on a dyno soon but if be happy with 10-15bhp top end gain.

Stu