Stock head or billet head?
If it a billet head pull it off and check the orings. When reinstalling use copper washers and acorn nuts, put a little 1211, 1184 or yamabond in the acorn nut before you put them on.
30 years ago someone thought they were needed. They are not. Right in the trash is where they go.
They ARE needed if you want to "shock the clutch"... but.. that's just a "hairflip"...
Yea so they make their own stinger tubes and silencers for T5 pipes is what I get out of it!
And honestly it looks like Toomey silencers also. Not sure on the stingers but those are probably toomey also.
AIRBOX VENTS FOR THE STOCK AIRBOX, A HIGH EFFICIENCY 2-STAGE UNI- FILTER FOR THE STOCK BOX, PERFECT JETTING KIT, POLISHED CHROME T5 PIPE BODIES, SILENCERS, STI
copy and pasted from the verbiage on their description on the web site!
They take a ton of port work to run well but the do run decent once worked over. Are they going to out perform your serval, no probably not. But not a bad cyl by no means, better than stock for sure.