Ok I have a set of metallic HFC and will shortly have a Nismo Y-pipe. Now I know that the Y-pipe of the Nismo is greater in size than the midpipe but how much power am I going to lose by going from Berk HFC to Nismo exhaust to oem mid pipe and muffler? Also will it cause any proplems in upper rpm ranges besides loss of power? I assume no but not sure. For everyones eae of mine I intend to change out the midpipe and mufler as well when excess play money comes around.

 

Does any one know the approximate weight for a Nismo y-pipe?

 

Let me get this straight. So you have a Berk HFCs and Nismo y-pipe and want to pair it with OEM mid-pipe and muffler?

I see no problem with that setup. You will not lose anypower, I think the OEM midpipe diameter is somewhere between 2.75-3.00". If I recall, Nismo y-pipe has a 3" collector. I seriously doubt you will lose any power with your setup.

 

Most likely I will change he rear as well but not yet.

 

The stock piping beginning from the merge (from the 2 inlets of the y-pipe) is 60mm (~2.36"). Most aftermarket exhausts are 76mm (~2.99") beginning from the same collector (where the 2 inlets merge on the y-pipe). Some, like the JIC y-pipe, are 80mm (~3.15") in diameter. Others, like the Tanabe y-pipe, have the 70mm (~2.76") diameter.

 

So can I assume that it will not make any more power either? Would you expect the sound to be any different?

 

Take it from somebody who actually has this set up (very similar). You do not make or lose much power compared to stock exhaust with HFC. The sound is similar to that of the one with just the HFC. There's nothing to worry or stress about. These are minute differences.

BTW, look at the pipe sizes I posted above yours for the correct sizes.

 

It would be a guess at best to say whether or not you are losing horsepower. The only way to prove it would be to strap it to a dyno and do before/after dyno runs. Which, IMO, would be completely pointless.

But like the moderator said, these are minute differences, nothing you should be tripping over.

$100 says you won't lose any horsepower.

 

Not worried about the power really that was just curiosity. Since my feelings that no harm from more flow to reduced flow was confirmed the rest is purely for information.

Thanks to all who posted.

 

What's with you and betting all the time?

You still owe me and that one dude (who I helped out) $100 each.

 

Lol. I just got 68mpg, I need to upload the image so I can prove you wrong...again.