Hi all,

I have tried to search around, but i did not get the right answer for "changing B pipe." I got my cat replaced with racing pipe from custom enterprise, which is a straight through pipe with sound dampener. Also currently i have a stock muffler.
Is the sound going to be much louder by changing my B pipe to a straight through pipe?
Can you guys feel the acceleration difference by changing the B pipe only?

Since i am on budget now, which one is wiser to change; B pipe or Y pipe? I am afraid to change the Y pipe because many people said that the sound will be much louder if the cat has been changed.

Please advise guys.

 

Depends on which engine you have, the 3.0 or the 3.5. If you have the 3.0, definitely go with the ypipe, if the 3.5, go with the bpipe.

 

Go with the Y pipe eather way...you'll love the extra power. Or better yet, why not do headers?

 

even on a 3.5, you'd be better off going with a y-pipe... like he said... get headers... if ya have the time and money to spend....

 

What's the theory behind this?

On my 3rd gen the y pipe design forced the exhaust from one of the header banks in the opposite direction of the flow towards the exhaust. On my 5.5 gen, the y pipe design is designed so that the flow from both header banks flows towards the exhaust.

I chose to get a 2.5 b-pipe becasue to the crimped sections of the stock b-pipe which force the exhaust flow from a 2.25 pipe to about a inch in the crimped sections.

I'd also love to do the headers but no cash right now.

 

Interesting... I've never heard it explained that way before, good to know though... anyways, I have a y-pipe and cat-back now... so I guess this discussion doesn't apply to me... but I do wish I had headers...

 

Does anyone have the sound clip for the combination Y pipe, straight through cat, and stock for the rest? is the sound loud enough to be heard inside the car?
I Appreciate your guys help.
Thanks.

 

look up soonerfans profile -- he has it in his sig

 

3.0L needs a Ypipe, the noise is just a little bit louder than stock with a stock rear muffler and Budget or Cattman B-pipe. My exhaust is really loud, headers, test pipe, Greddy. I'm ditchn the Greddy for something else now.

 

If you have a 3.5, I suggest changing the B-pipe due to 2 major crimps in the piping. Here are 2 low-quality pictures that I've taken of a side-to-side comparsion of my Warpspeed Performance B-pipe vs. my stock B-pipe.
The crimp close to cat:

Crimp next to resonator:

 

BlackBIRD- do you have the Cattman or HS headers?

 

Thanks guys for the respond. Also thanks whazzzzuup for the picture. It helps me a lot. Last night after i saw your picture, i jacked my car up at 3AM due to my curiosity of that crimp. And yes My AE has that crimp too.

I got another question, How restrict inside the resonator of our B pipe (the one that looks like a long can). Is there anything blocking the air flow like the one that obviously be seen on the whazzzzuup picture after the resonator?

whazzzzuup said "I suggest changing the B-pipe due to 2 major crimps in the piping," may i know which one is the other one. I only saw one which obviously after resonator.

Thanks a lot for your help guys.

 

change the y-pipe (single best performance mod for a VQ30)

see my sig for the video SOONR1 was talking about (y-pipe, straight pipe, stock b-pipe and muffler)

 

No problem. The other crimp is in the bottom of first picture, on the stock b-pipe, by the flange.

 

Good pics man... too bad I didn't take any of my 5.5 Gen's OEM b-pipe before I sold it... would have liked to compare it with your pics....

 

I've got HS headers with relocated 02 sensor bung so that it clears the A/C compressor. HS headers fit 3.0Ls but the 02 sensor hits the AC compressor. HS provides ya with 2 extra O2 sensor bungs to weld on for the Post Cat O2 sensors, but I didn't install my O2 sensors that are after the cat, they are just zip tied in the engine bay and I use O2 sensor simulators to fool the ECU into thinking the cats are still in place. One bung I used for the front bank O2 sensor that is before the cat (these controll the A/F ratio) and the other bung HS send I used in my HS downpipe/ypipe for my PLX WideBand O2 sensor. I run Emanage to tune my A/F ratio, I am gonna get the TS L-Spec ECU next. For now I'm waiting for my new VIAS intake manifold as mine is completly broken and I can fix it with JB weld. My Greddy Exhaust is banging all over the place now (stiff JIC Magic FLTA2s) so I'm gonna have to ditch the Greddy for JIC Magic, Mossy, FrankenCar or Cattman catback. I got my Greddy used and for some reason it didn't fit too well like other Greddy exhausts I installed.

 

To fix the problem with the crimped sections, I had the muffler shop cut it out and put a pipe in it's place. It only cost me $50 and about a 1hr. I did not to have problems with sound from aftermarket Catbacks.

 

Hi jazzyjay. After you cut the crimped section, did you notice a louder sound coming out from your mufler? Also, do you notice any better acceleration. Because better acceleration is what i am looking for.
Thanks.

 

If by that ya mean a 2.5" diameter b-pipe with no resonator, then yes, but if ya just get a 2.5" b-pipe with resonator, the sound will be fine. It will probably have a nice low tone (barely noticeable) w/o a drone since ya have the stock muffler on.

I had the entire cat-back replaced (twice) and felt no difference whatsoever... except maybe at WOT and over 80mph... but that could just have been my imagination...

The y-pipe will give ya noticeably more power... you'll feel the difference for sure... and if ya retain the stock cat-back or even an aftermarket b-pipe with stock muffler, no, it will not be loud. I have a Cattman y-pipe with Frankencar cat-back and it barely sounds louder than stock except for a low throaty tone on idle and WOT... you can tell there's a difference, but its not overly obnoxious.

 

Listen to his video and you'll see how nice it sounds w/o being overly loud...

 

I always thought that the y-pipe on the 3.5's didn't give that much power because the precats are on the headers? I know that with us 4th gens, the y-pipe gives by far the best power gains for the dollar because ours are right on the y-pipe portion. As well, i'd probably go with the b-pipe over the y-pipe if i had a 3.5, the gains seem to be very strong with replacing the b-pipe.

LEMAR

 

You're absolutely right... and I wish I could afford headers for my 3.5 and ditch the y-pipe... however, Adi's car is a 3.0, only 2002s and on are 3.5s... so its just the same as it is for you guys... good gains from a y-pipe...

 

I did the Y-pipe, fixed the crimped sections and a UD pulley all before I pulled it off the lift. So I do know the accual power gains. Sound is a big thing with me so I wraped the y-pipe with exhaust tape. The is car very close to factory sound.