Does anyone know of a Y-Pipe that will fit on to a stock exhaust system from stock cats to a stock midpipe, I want more flow and hopefully just a little bit louder sound. I have used the search function, with little help

 

I have a UT y-pipe along with a coupe mid-pipe...i think that's your best route to get more sound. Not sure if the Y alone will (as I installed my y & middy at the same time....there are a few aftermarket manufacturers who make them that fit stock (like the UT (Unlimited Tuning)).

 

The problem with what you want to do is pipe sizes.

All the Y-pipes on the market have a larger DIA than the OEM mid-section.
The flanges bolt up but the pipes don't line up.

To do this you would have to modify the OEM pipe by cutting a section out.
Then fabricate a transition piece.

 

From what I have read (and I hope I understood correctly), any of the available aftermarket Y-pipe can bolt on to our stock system. However, the main problem is disrupting flow- the various aftermarket y-pipe's generally have a 80mm inlet, while our stock exhaust system is at 65mm. What is necessary to make the exhaust flow smoothly are aftermarket exhaust flanges that help to maintain the same constant airflow.

 

Yup, right idea, but the flanges alone won't work.
You need a transition section; the longer the better.

That's why some are using the 350Z mid-pipe.
It's about 6" shorter than the OEM (or coupe)
Then thay make the transition with a custom 6" piece.

 

Whoops! I was thinking of the flanges as the transition pieces.

Gsedan35 had an excellent write-up about this, and the part that he mentioned would work for our application, is a slip-on reducer cone such as this one: http://store.summitracing.com/defaul...w=sku&N=300611

 

That would work great.
It needs to be cut into the inlet of the mid pipe with a new flange to mate with the Y.

 

Thanks for the replies. I don't want to have to cut or weld, looks like a catback is the best option.

 

with cat back i would go with a japanese company since they are the only ones except for STILLEN. buying a cat back is the best, since cost for custom will run almost the same, plus not too many shops mendrel bend or work with stainless steel. so you might have to make appointment