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The "CORRECT" 1969 351W 4V and 390 tips have a 1-3/4" I.D. inlet, so even the stock 2" tailpipes used on 351W & 390 reduce down at the ends to slip into these tips. Front pipes & transverse muffler were all 2" as well ... the 351W H-Pipe on the other hand is 2-1/4". 1968-69 428 cars had full 2-1/4" exhaust from the H-Pipe to the tips. Instead of using the same restrictive and separate tips the 351W & 390 cars used, the 428 cars came with special 2-1/4" tailpipes with the SS. Twin Tips welded right to the end of the tailpipes for much better flow, picture & details here: https://www.scottfullerreproductions.com/catalog/item/4595229/4650641.htm Back in the 80's, I put reproduction big block 2-1/4" exhaust on my 351W car because I was told by the seller it would bolt right up to a stock 351W H-Pipe ... YES IT DOES. To be able to use the stock tips, I crimped the ends of the 2-1/4" tailpipes down to slip into the 1.75" inlets of the stock tips. My 1st set of tips were the Ford replacements that were just plain chrome plated steel (without the correct rolled S.S. tips), I got these in 1984. Once correct reproductions made of S.S. with the rolled tips became available in 2005, I bought a pair of these ... my chrome ones were pretty rusty by then anyway. In 2019, I bought a pair of the custom-made S.S. tips that are externally identical to the O.E. tips but have a 2-1/2" inlet and ZERO internal restriction like the O.E. tips have. They are works of art !! Cut my restrictive ends off of my 2-1/14" tailpipes and welded on 2-1/4" I.D. to 2-1/2" O.D. adapters and removed that bottle neck !! Read all the details in the thread I posted on the subject here: New '68-69 Rolled Lip Exhaust Tips with 2.5" Inlet - 1969-70 Technical Forum - 69stang.com and 1969stang.com The 1969 and 1970 Mustang Supersite Terry ... in previous threads, you have stated you want to put the largest size exhaust on your car that will fit for the least restriction, so you would then want to use these 2.5" I.D. inlet tips to finish it off and make it look stock !! Doug