S90 74mm coupler used?

[v8s_are_slow]

I'm just wondering what size coupler you guys are using. I have 2.5" piping going to a 74mm throttle body. I ordered a 2.5"-3.0" coupler and I couldn't get it on. So ordered a 2.5"-3.25" coupler and it just feels loose. I mean I use t-bolt clamps but just wondering what you guys are using in the case that I should be looking for something that would fit it better. Thanks!

 

[PlanZero]

I've noticed differences depending on manufacturer. You can get 4ply silicone couplers so cheap on eBay I'd order another one just to see.
I have a couple spots on my fmic setup with "loose" connections, primarily where the pipes meet the oem tb elbow and the j pipe. The t clamps that came with my kit were too big so I just have worm clamps on those areas. Been holding up fine for a few years now.

 

[Eddie Tsi]

I use the one from extreme psi 5” straight 2.5”-3” reducer. Fit fine, but It’s a struggle to get the 3” t-bolt clamp on, because of the thick O.D. 3.25” t-bolt clamp may be better fit.