Nismo OEM exhaust compared to aftermarket...

Mythic · 08-27-2010, 06:21 AM

Quote:

Originally Posted by Rooskey

I have the nismo exhaust with Berks HFC's. Im just not willing to spend over a grand for five or maybe a little more horsepower for a new cat back exhaust .As for myself I am considering a new X-pipe to replace the stock H-pipe. If the exhaust note after that is not to loud and obnoxious I might consider removing the resonators, but I doubt it. Please no more trucks with big four inch loud a$$ exhaust tips. It just dont spell cool at all!!!

Lol i had 4.5" tips on my SRT, and 5" tips on my 08 Tundra

but they both sounded amazing

These Berk HFC's (high flow cats?) everyone is talking about, do they give alot better throttle response? What kinda $ are we looking at?

Also (sorry for all the questions) how many cats do these cars come with?

Lenny · 09-01-2010, 08:09 PM

there are two cats; one per header

in most exhaust layouts, the catalic converters are where a lot of back-pressure builds up due to the setup, hfcs free up that pressure and allow for a briskier throttle response, though often at the expense of some high-end power (loss of back-pressure in high rpms tends to lose hp, tho i'm not sure if thats the case with the Z)

370Zsteve · 09-01-2010, 08:32 PM

Quote:

Originally Posted by Lenny

there are two cats; one per header

in most exhaust layouts, the catalic converters are where a lot of back-pressure builds up due to the setup, hfcs free up that pressure and allow for a briskier throttle response, though often at the expense of some high-end power (loss of back-pressure in high rpms tends to lose hp, tho i'm not sure if thats the case with the Z)

It's not the case:

Run Details

Jordo! · 09-01-2010, 10:37 PM

Quote:

Originally Posted by Lenny

there are two cats; one per header

in most exhaust layouts, the catalic converters are where a lot of back-pressure builds up due to the setup, hfcs free up that pressure and allow for a briskier throttle response, though often at the expense of some high-end power (loss of back-pressure in high rpms tends to lose hp, tho i'm not sure if thats the case with the Z)

Generally, without raming more air in, a less restrictive exhaust will often lose some low end power while picking up some high end power -- this is because optimal cylinder filling tends to happen higher in the rev range, at which point, smaller diameter piping or cats may be somewhat of a restriction.

However, at low speed, when there is less cylinder filling, those "restrictions" are closer to approximating optimal exhaust flow under those running conditions.

So... in short, extra exhaust flow is only helpful when/if you are sucking in enough air to take advantge of it.

In real life, you end up with some sort of compromise, and then tune around that.

370Zsteve · 09-01-2010, 08:29 PM

Quote:

Originally Posted by Mythic

Lol i had 4.5" tips on my SRT, and 5" tips on my 08 Tundra

but they both sounded amazing

These Berk HFC's (high flow cats?) everyone is talking about, do they give alot better throttle response? What kinda $ are we looking at?

Also (sorry for all the questions) how many cats do these cars come with?

High-flow cats give the most gains of all the bolt-ons.

09-01-2010, 08:09 PM	#2 (permalink)
Lenny Base Member Join Date: Aug 2010 Location: Virginia Posts: 9 Drives: 05 G35 6MT Rep Power: 16	there are two cats; one per header in most exhaust layouts, the catalic converters are where a lot of back-pressure builds up due to the setup, hfcs free up that pressure and allow for a briskier throttle response, though often at the expense of some high-end power (loss of back-pressure in high rpms tends to lose hp, tho i'm not sure if thats the case with the Z) Last edited by Lenny; 09-01-2010 at 08:11 PM.

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