Installed the Quad tips on a 30, and had to cut the right side out to match the left side, see My Garage for pics, but having looked at a 35, you will need to widen both sides and may trim up a bit to the top of the raised portion. My cutouts are 21cm wide by 8 cm high [8.25" by 3.2"], hope this helps.
The dual 35 tips use the same mufflers as the Quad tips and a "Y" pipe to shrink them into 1 outlet
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