I purchased part# SPES01134S2.0. You need the part number for this review to make sense. Overall, the cutouts worked for the 1970 Camaro i installed them on. I had plenty of ground clearance because of the smaller motor design. The only downside is that the thick housing that the butterfly resides in, does not offer an easy way to add an extension pipe to direct the exhaust in another direction. I understand the reason for the thick housing, heat, warpage etc but a piece of tubing pr-attached would be nice so you could have the option of adapting to it in an easy fashion.