Which One Is Better

[KURAUN]

Which front/dump pipe a cat should i go for?

BOS (batmbl)

cat 3" large body cermaric inside $230

and SS dump/front pipe - $380

= $610 all up

Just Jap

SS cat 3" (xforce) flows 570cfm $160

and dump/front pipe SS - $250 +p&h

= so roughly $450 if del is $40

Is there any real difference between BOS and JJR? THe cats would be roughly sam size, but the dump/front pipes would there be much difference between these, cause its an extra $90 just to go for the BOS one....

I know that the BOS front/dump is proven to add 16rwkw and, would the JJR one give the same kinda power?

[cheez]

u could even get a flyn dump front but its not split. IMO it would be better than both the above mentioned as the airflow never gets interupted from the turbo to the cat.

and about the cat, just get teh JJR 1, it is more than sufficient and is rated i belive to 250odd RWKW. correct me i im wrong. unless you plan on more than that then lash out and spend like 400 on a cat.

[KURAUN]

yeh was leaning towards the JJR cat more....probably wont go near 250rwkw

but the front/dump pipes im after split ones but out of this two not sure is one is better than the other?

[Basti]

split dumps try to minimise the turbulence in the exhaust which you get when the wastegate opens. it separates the two flows until further down the pipe. therefore the longer the two flows remain separate and the smoother the two pipes join up, the better its gonna be. you need to look at the pics of each.

i dont know bout the fitment of either model. you also need to consider where the o2 sensor hole is placed. im guessing that both have good fitment and design* so its probably up to your tastes

*note i havent actually seen either of these pipes

[R33GOD]

just get a 3inch front/dump pipe in a mandrell bend made up from your local exhaust shop and get a 3 inch metalic hiflow cat while your there. should cost you about 800ish including labour. im not using a split dump, complete waste of money if ur not going past 240rwk.(hardly no turbulance) if your gonna go past 240rwk youd need a non turbulance dump pipe.

[KURAUN]

Pics.....

So would there be much difference between these two?

I dun really wana fork out another $100 if its only a tiny difference

1st pic is BOS, 2nd two are Just Jap

[jd06]

I have recently purchased a BOS importing Catco catalytic converter & have no complaints!

The Catco product is excellent quality and is fully ADR approved. It also comes with quality gaskets.

I could not believe the difference in weight between my standard cat and the Catco item. This alone suggested the internals where considerably different.

Chat to Michael at BOS as you may only require the smaller body 3 inch cat which is said to be suitable up to 230rwkw.

The larger body 3 inch unit is best for vehicles over 230rwkw.

Which front/dump pipe a cat should i go for?

BOS (batmbl)

cat 3" large body cermaric inside $230

and SS dump/front pipe - $380

= $610 all up

Just Jap

SS cat 3" (xforce) flows 570cfm $160

and dump/front pipe SS - $250 +p&h

= so roughly $450 if del is $40

Is there any real difference between BOS and JJR? THe cats would be roughly sam size, but the dump/front pipes would there be much difference between these, cause its an extra $90 just to go for the BOS one....

I know that the BOS front/dump is proven to add 16rwkw and, would the JJR one give the same kinda power?

[Meek34]

Check the grade of stainless used for both dump pipes, could be the reason for difference in price.

I have BOS dump and metal cat (706cfm), can recommend.

[KURAUN]

I have recently purchased a BOS importing Catco catalytic converter & have no complaints!

The Catco product is excellent quality and is fully ADR approved. It also comes with quality gaskets.

I could not believe the difference in weight between my standard cat and the Catco item. This alone suggested the internals where considerably different.

Chat to Michael at BOS as you may only require the smaller body 3 inch cat which is said to be suitable up to 230rwkw.

The larger body 3 inch unit is best for vehicles over 230rwkw.

Well atm i have 194rwkw on 11psi so ill need the larger body cat for sure

Check the grade of stainless used for both dump pipes, could be the reason for difference in price.

I have BOS dump and metal cat (706cfm), can recommend.

Is there any real difference in the metalcat compared to the large body? i know cermaic inside for large bosy and metal for metal cat...but does this actually help in performace....would this add power if i went the metal cat?

[Meek34]

==

Well atm i have 194rwkw on 11psi so ill need the larger body cat for sure

Is there any real difference in the metalcat compared to the large body? i know cermaic inside for large bosy and metal for metal cat...but does this actually help in performace....would this add power if i went the metal cat?

Not sure of the flow rate of the large body one, but I think the metal cat has higher flow rate. Yes you are right about the internals. If you ask Michael (BATMBL) he will be able to tell you. I assume the higher flow rate the less restrictive therefore allowing the exhaust to be extracted more quickly through the exhaust system, which will also allow your turbo to work more efficently creating more power.

The only mod I have on my R34 GTT sedan is the front dump pipe and metal catco cat from BATMBL and 3" Apexi exhaust, also a K&N panel filter, I made 166.4rwkw.

I think I remember you on from the 4 door cruise last weekend, were you the young guy talking to RCHOO in Warburton and didn't go up to Donna Buang either. I was the silver R34 sedan with the kids.

[KURAUN]

lol yeh that was me

Well you have seen my mods now and thats y im trying to get the front of my exhaust sorted out....but not sure which way to go, i wana try to get as much power out of this fron/dump pie and cat as possible, and make sure it flows well....

But ill talk to michael at BOS and see what he reckons

I also found out that the just jap one is only 3 inch where the seperate wastegate split joins to the bottom of the front pipe, whereas the BATMBL one is just after the dump part of the front pips, so more power to be had there for sure......but now just to work out for the cat

Thanks for the help Issy

[Meek34]

No worries, post up what Michael advised and good luck. Might see you at the next cruise.