mgl

iTrader: (10)

i thinking bout changing the y-pipe and b-pipe. Is 3" piping too big?? I heard that larger piping can actually lower your low end power and is only for F/I. Is this true? Will this hurt my performance?? any thoughts or suggestion is appreciated.

mofoz

iTrader: (1)

the larger piping will not hurt your performance. The loss of low end power is often attributed to loss of back pressure, and with headers/test pipes, high flow cat back, there is little pressure, and you may lose a little at the bottom, but it will make up for it on the higher rpms. All cat backs use 3" pipes with much success. You should be fine. And i love my injen CAI

mgl

iTrader: (10)

thanks.
i do not have headers/test pipes, or an aftermarket exhaust.
all i got are the rt cats so far. i want to keep my oem muffler and switch out the y and b pipes to have a more free-flowing set up. but i don't want my performance to suffer, so how much do you think my low end power will be affected??

btw... glad you like the CAI

mofoz

iTrader: (1)

i really think low end will stay the same, with alittle added up top. Even if you throw at cat back on you will still be fine IMO. The Y and B pipes will open it up a bit more, but your low end will stay the same most likely.

KJY9

I went with a Fujitsubo Y-Pipe which has a 3" collector, into the Pro-1 Exhaust which is 3" as well. That along with headers and high-flow cats. No decrease in power...as a matter of fact there was an increase! No problems here and sounds great as long as the silencers are in

FLY BY Z

I have true dual 2.5 inch catback and am about to install XERD headers. I'm not having any low end torque problems. Even with the open exhaust and JWT flywheel I get a 2.0 60 foot in the 1/4. It will pull off the line pretty good.

PhoenixINX

Fujitusbo y-pipe with 2.5" collector, into 2.5" collector on the Apex N1...

Apex N1 then opens to 3" before muffler.

No loss here.

Jun

iTrader: (45)

i was thinking of doing a 3" catback w/ dual HKS titanium canisters (like the one wicked4u2c posted and photoshopped). I was wondering if i was going to lose power because of this (no backpressure).

i guess it would be the same question it's being asked here?

mofoz

iTrader: (1)

i really dont think the 350Z will lose power from 3" piping. Other cars might that have tuned exhausts that have the minimum amount of back pressure, but the Z seems to love high flowing exhaust systems even with headers, high flow cats, and 3" Y and B tubes. I noticed alittle increase in the low end and a decent amount of increase at the top from my nismo catback.

mgl

iTrader: (10)

thanks for the replies.....
i will probably be doing the y-pipe and b-pipe 3" mod soon. i hope it sounds nice with my rt cats. anyone know if it'll sound "raspy"???

350zdanny

Does your car sound raspy with the RT's now?

mgl

iTrader: (10)

sounds nice. but its a little raspy when i rev it up 4500 to 5000 rpms or so. it doesn't really bother me, but i would not want the "raspy-iness" to increase. especially since the mid-pipe resonator will be different.

Jason@Performance

iTrader: (11)

Mid pipe on nismo exhaust is 3.16"
and Y pipe collector ends up at 3.16 as well as the JIC y pipe...

MCopare

iTrader: (8)

I have the ultimate racing 3 inch y-pipe connected to the HKS CF/Ti Canister and it sounds perfect, not raspy at all.

PhoenixINX

Interesting... Doug's cats have never been raspy.

Wonder why the RTs are...

KJY9

PhoenixINX

[blonde] [/blonde]

Jason@Performance

iTrader: (11)

when have the RT Cats been raspy when it wasnt a user install error?

yours would be just as raspy too...

FLY BY Z

In other words, what else would we really expect to hear from you regarding crawford?

mgl

iTrader: (10)

I'm pretty sure it was installed correctly.
its not a big raspy noise or anything.....but i can hear a little bit of raspiness when i rev it up to 5000rpm. not a horrible noise, but if you listen for it you can hear it.