Just the clamps. I have an RS*r concept exhaust on my integra that is identical in design to the tomie minus the titanium. A slip fit exhaust like these that have the springs as options are so when you go off track and the rear section hangs on something with enough force it comes apart instead of tweaking the hell out of the rest of the components. Being that I don't track the car right now, I just run the clamps on both cars. You can do either the springs or the clamp, not required to run both.
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