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Gt 550 expansion chambers

Posted: Tue Apr 11, 2023 5:19 am
by Hawky416
Good afternoon
This has been a long project!
So I’m building a cafe racer style gt550 and time has come to sort exhausts for it, I’ve managed to find someone that will actually make a set of expansion chambers for me but he needs sizes of the cone to go from, he said he can take the head off and measure the ports and go from that but it doesn’t usually work first time and you end up having to make 2 or 3 sets to make the correct power!
Has anyone made a set? Or have the dimensions to start?
Any help is greatly appreciated!

Re: Gt 550 expansion chambers

Posted: Tue Apr 11, 2023 11:22 am
by jabcb
Higgspeed in the UK makes 3-into-3s & 3-into-1s for the GT550. https://higgspeed.com

My 72 GT550 with Higgspeed 3-into-1s:
ImageSCMR_2022_2319 by jabcb, on Flickr

Re: Gt 550 expansion chambers

Posted: Thu Apr 13, 2023 12:52 pm
by Alan H
Lots of options here - viewtopic.php?f=2&t=14375&p=175556&hilit=Abbey#p175556
Mine is at the bottom of the 1st page , by Mick Abbey, https://en-gb.facebook.com/mickabbeytuning