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Yeah I think you should toss the Spec D down the line for a superior quality product.
The largest power gain is in the header. Yes, you can pick up a few hp with a catless front pipe, but be sure to get one that is resonated.
In the simplest of terms UEL is boxer rumble+mid range torque while EL is a smoother more 4cylinder-esque sound with a bit more top end hp.
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