yes pretty happy, starting at 75hp at 3500 and going up to 99hp at 7500 and with lots of torque. all good. can wait for the ARC Forest rally in 2 weeks. but i am still amazed at how much better the torque is with the smaller exhaust, it is like a different car.

What was done with the exhaust mate?

In this photo you can see i had fairly short secondaries into a 2.5" collector.
then machine bent 2.5" pipe into a magnaflow 2.5" stainless muffler then 2.5" machine bent over the diff and out. but the machine press bending causing it to be crushed a little this can have an effect on gas velocity. and i think might have caused the flat spot in the middle of the torque curve.

So I lengthened the secondary

Very interesting! Thanks for the explanation. I'm glad it made a difference for you.
Matty

Rally1200 . who made your extractors ?
they look like a good design

I made them myself, bought a whole bunch of mandrel bends and 3 days of trial and error. i was trying to get all primarys all the same lenght and i think i got pretty close.

Ahhhh, the Tri Y design is always a good choice & seems to give a noticeably flatter torque curve than other tuned length types.
This is why they are also good for the street. Sometimes it's better to lose a little peak output in exchange for a wider & more usefull torque range.
Nice bling too.

Good horsepower but very nice power curve from a short-rod A14. Well done!