Yea I have to say I think U-bend whether its test pipes or hfcs, prevents any CELs. I have res. test pipes now from GTM and they have a U-bend just like my FI HFC had and haven't had any CELs yet with about 500 miles on them. Never had any with the FI HFCs either. Check out the picks of how long the bends are on my new pipes
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