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  #1  
Old 02-27-2015, 02:30 PM
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95 B cats and y-pipe

For those interested I thought I would show the process of putting together a set of cats and y-pipe for my 95B.

I will build headers for it as well but that will wait until the next engine out.

For now the plan is to build replacement cats with Magnaflow 59904 metallic cores.

I would do test pipes but prefer to keep the exhaust smell to a minimum.

I'm also going to build a new y-pipe. Materials are ordered and flanges are being cut by a local water jet company. (I couldn't find any ready available with the proper bolt spacing).

First step is as pictured, building simple fixtures off of the original parts-
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  #2  
Old 02-27-2015, 03:35 PM
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Looks really cool but why not just build it up on the car instead of doing all the jigging?
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Old 03-06-2015, 04:24 PM
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If I'm building something from scratch, no problem building on the car but if I have a factory part and I want to match the dimensions, I find it easier to fixture the part and build it on the bench.

This way I can also avoid tack welding the tubes in the car.

Still waiting on some parts. Cats have not arrived yet and the flanges I'm having made are also not finished.

I did start on the y-pipe. Using mandrel bends and merge collector from SPD.
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Old 03-06-2015, 04:56 PM
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Really nice work so far!
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Old 03-06-2015, 05:12 PM
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Talented Jim.
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Old 03-06-2015, 05:19 PM
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That is some pretty nice looking welds there.
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Old 03-06-2015, 06:03 PM
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Nice gold welds, keep that heat down

Looking great !!!
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Old 03-06-2015, 06:13 PM
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Like always from you jim nothing but the best
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Old 03-06-2015, 07:32 PM
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Thanks guys! I appreciate it.
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Old 03-07-2015, 12:12 PM
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Very smart-looking welds there. I also had my cats rebuilt with aftermarket metallic cores (my 5.2 cats cracked). Aside from cost, there's no reason to ride dirty with today's sport cats.

May I ask if something is wrong with your original Y-pipe, or the reason you wanted to build a new one?
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Old 03-07-2015, 12:27 PM
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Thanks Chan. I don't like the fuel smell with no cats which is the reason for keeping them on the primary side.

As for the y-pipe, no problem with it, I just wanted to build a replacement for better flow, sound and lighter weight. I don't think the metallic cores in the y-pipe are restrictive but the "Y" section could be improved upon as the internal transitions are not very smooth.

Much to be gained in power? I doubt it, but it's winter so it gives me something to do
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Old 03-07-2015, 02:30 PM
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I purchased one from Bradan but never put it on the car. They did a thread awhile back with dyno results. Fabspeed claims between 5-8 hp. I bought another OEM Y pipe figuring I would keep the OEM look and gutted it, but did not put that on the car either after hearing from others that they didn't notice any gains other than a change in sound.

Bradan F355 2.7 Y-pipe
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Old 03-07-2015, 02:50 PM
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Looks great! I would like to do the same, cats on primary and secondary open. Should help calm my exhaust sound in normal driving as well.
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Old 03-07-2015, 03:05 PM
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Very, very nice, Jim!

Barry
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Old 03-07-2015, 03:53 PM
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Anything homemade is better then bought in my book
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Old 03-07-2015, 05:57 PM
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That looks very nice indeed. Let us know if you are offering a recore service
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Old 03-09-2015, 06:30 PM
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Lookin good so far!

I've always liked to look of the Kriessegg Y-pipe if you haven't seen it yet.

Kreissieg M2.7 Y-Pipe Ferrari F355 94-99
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  #18  
Old 03-09-2015, 08:03 PM
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Thanks Ken. That Kreissieg piece looks really nice! I originally thought about doing it that way (build the merge out of the mandrel bends themselves) but SPD was going to charge me another $250 for setup to do 2 60deg (I think that's what it was) bends as they are not a stock item.

I do like the look of the 2-1 merge collector as well, takes up a bit more real estate
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Old 03-09-2015, 08:28 PM
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SCHWING!!!

Nice job!

I wish I had welding skills.
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  #20  
Old 03-17-2015, 09:33 PM
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Thanks! I finally got my flanges today and was able to finish the y-pipe. I wasn't able to find flanges in the correct size so it ended up costing me $50 each to have them water jet from .600 304 stainless and machined with a bevel.

Simple part, easy to make. On to the cats now.
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