Hi!
Before I designed the intake I fitted the HKS Drager exhaust.
And I really noticed an improvement in responsing and such.
But it took some time, because the ECU had to read the new values and correct the air/fuel. After a few hundreds and thousands km it seemed to work fine.
An ECU reset wouldn't have been bad I think, it would have worked quicker.
It revs much faster at low rpm, so it got a more agressive acceleration like Golf GTI or anything at low-end power.
In the high-end power area the power didn't increase very much, hardly to notice.
But it pulls much better from 2500-4000rpm.
Not to forget the rumbly sound it makes when accelerating.
After fitting the intake the sound got just deeper and louder than before.
And that not only until 3000rpm...... sound is like:
1000-3500 rumbly deep
3500-6500 like a race car, really cool.
I recorded it with a digicam, maybe I can post it with a link.
But I also noticed an increase in fuel requiring.
In cause of the increased air flowing the ECU also increased the fuel to set the A/F mixture in correct ratio.
But it didn't increase all too much.
I think with an AFC you could adjust it much better to get more power depending on the advantages of an intake and exhaust.
NG, RR