Larini 2.7 Y pipe finally arrived but have some concerns

Exhaust science is a secret recipe.


I’ve asked Larini for a replacement tip and they said it could not be done. Said I would need to ship it back for repair on my dime. Bit of a hassle shipping back and forth as I would have to pay duties again.

 

Ken, did you try contacting GP Headers? They might be able to fix it. You saw the work Zack did building my headers. Another option would be to contact a shop that does auto restoration, the type that can fab up body panels from scratch.

The easiest way would be if Larini would send you one tip or a set even if it cost you a few dollars for the tips.

If GP didn’t want to take it on there is Stainless Works or SPD exhausts. The muffler looks very nice except for that tip and I like you wouldn’t put that one my car until it was fixed somehow. Don’t give up just yet as there are some very skilled metal fabricators out there. Jim has done some very nice work on the headers that he is building as well as his muffler and y pipe.

 

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I would say to them there is plenty of skilled craftsman over here that could do the repair easily and like you said that you didn’t want to take a chance and incur more damages by having to ship the muffler back and forth.
One thing that I don’t understand is that if you chose someone that could fix it properly why would they think that the quality wouldn’t be good. You are not going to let anyone touch it unless the repair could be done correctly. I wish you the best on resolving the situation.

 

Those email exchanges were in 2021 .


I’ve come to the conclusion it’s too much leg work to repair without knowing how good or bad this thing sounds. If no one takes it off my hands, I’ll put it on someday and if I like it, then I can re-visit, whether buying a new one or repair.

 

Ken, did you put a damage claim in with the shipping agent? That's where I would have started.

 

I did not. It’s up to the shipper to do it. Plus, I think I might have reported the damage late as I didn’t open up the package immediately.

 

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Third manifold from top is actually a SECA manifold.

 

Would this design not work better for flow?
Seems silly to have both banks connecting at Y interface, when the flow would be much less disturbed flowing/connecting outward. Thoughts? I assume you'd still need to heat wrap them or shield them.

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https://www.topendmotorsports.com/ferrari/f355/engine/exhaust/kreissieg/spiral-style-connecting-y-pipe-stainless-27892.php

 

Looks neat but I can't think of any reason it would flow better. A part built with the least amount of bends in the largest radius would flow the best.

 

Here are the actual listings for them. Maybe so on the other system. The outlets are different. Both state 8kg weight. Anyone know the stock Y-pipe weight? It looks huge in the engine bay.

I imagine these will need heat shielded in some regard?

Y-Pipe:

https://kreissieg.ocnk.net/phone/product/107

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Spiral Pipe (no mention of valves that I see):

https://kreissieg.ocnk.net/phone/product/107

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And honestly looking at their Y-pipe design, it's much different internally with the way the gasses merge than the thread starting Larini internal.

Anyone care to run through where the cats are in this platform? I'm new to it. Car (2.7) gets delivered this coming week amd wanting to get my bearings in what is what on it.
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I believe it's the following. Please correct me if I'm wrong.


Primary cats in the headers (mine are stock/want to switch to Tubi 200cell )

Y-pipe (mine is stock/I'll prob switch to the Kreissieg Y-pipe above) I assume I'll have to high-heat coat it, shield it, or blanket it?

Large secondary cats (where the O2 sensors are correct?)

Muffler box (mine has a delete out to triple -center exit)

Outlets

 

There are no cats in the headers. There are main cats and (at least on the 5.2 cars) cats in the y-pipe.

 

Ahh gotcha. Ok. I appreciate that info.

my R8 has primary cars in the headers. I just reread the Tubi page. No cats.

So with the above Y-pipe, it's just primary cat deletes, and if I keep the secondary cats in the larger side mufflers that will be ok for O2 sensors.

 

You won't need to shield the y pipe without cats, it runs much cooler than the cats do. I have the kreisseg spiral y pipe but haven't given it a proper test yet, it fits with the stock bypass valve.

 

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Good info guys. Thank you.

I was considering doing the Jet Hot ceramic coating. It comes in 3 temp coatings. I found it when looking into the Soul exhaust option for my P-car.They'll coat them for you prior to delivery.

Classic is a polish coating so you'd never know it's there. And you'd have polished metal look. Up to 1300* protection.

Then there's Extreme (2000*) and Ultra Extreme (2500*). Which are thicker coating and do even more.

That heat has to go somewhere though, and I don't want it going straight to the big cats. And melting the bumper.

So I figure either do nothing, heat wrap, or do the classic polish. The manifolds are already wrapped if I do the Tubis.

https://www.jet-hot.com/

 

There's a heat shield above it to keep the airboxes cool, but the cats in the y-pipe would get hotter than a catless version (especially as these cars run on the richer side at high rpms) so it'd be cooler than the stock setup regardless. There are no downstream cats from the y-pipe, when it's open it bypasses the primary cats so won't do anything to them - and again, without cats it'd be cooler than the stock setup. I don't think it'd hurt anything, though, if you wanted to keep engine bay temps down a bit, but by not having cats it'll be cooler than stock even with nothing.

 

Coatings don't reduce heat nearly as much as header wrap or heat blankets. If you have it all apart, I can't see the downside in wrapping the Y-pipe. It's crazy that the entire exhaust system of the 355 travels through the engine bay and is largely not shielded.

 

The only downside I've seen there is what can happen to the factory headers (which are shielded and insulated) - all of the heat stays in the pipes and they can deform/melt.