3" or 3.5" Coupler for FP 84mm (3.3") Compressor Cover

[GSLENK]

I am trying to make a more suitable intake for my FP RED with the 84mm flow advancement cover. Just like the one pictured.

The only problem is that the outlet is ~3.3 inches. I stretched a crappy 3" auto-zone coupler over it, no problems. But I feel like a 5-ply reinforced coupler is going to give me a hernia if I try this.

Before someone says "get a 3.25" which I would, if they existed in the 45 degree, 4" to 3.25" flavor. So far I can only find 4->3 and 4->3.5.

Also this is the cheapest route I can find. at $37 for the 45* aluminum, and $37-35 for the silicone ($74 in total). Using a 4->3.25 straight reducer and two 45* aluminum elbows would cost $87 PLUS another coupler to join them or even more $$ to weld (ball park $40, based on past experiences around here, $127 in total).

So, has anyone done this before, and which size did you use?

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[athlete3344]

Would you be able to get the 3.5" and maybe use some wrap to make up the difference (if necessary)?

Also,
http://www.ebay.com/itm/like/120724810996?lpid=82

 

[GSLENK]

damn you are good. I swear I tried searching ebay too. It would be nice to have longer legs on the coupler but for that price I don't think I can go wrong.

 

[athlete3344]

I wouldnt be surprised if you could find one a bit longer. With a turbo that size, does the inlet diameter cause any problems if its too small?

 

[GSLENK]

I wouldnt be surprised if you could find one a bit longer. With a turbo that size, does the inlet diameter cause any problems if its too small?

Turbos are not meant to suck air. They are meant to push it. Inlet restrictions will screw with performance. Others have said it increases wear and stress on the shaft if the inlet is restricted.