i am running the asura 3" dual with a 2.5" resonated test pipe right now. dont get me wrong, the exhaust sounds awesome getting on it. crusing its fine too. its part throttle stuff in the 3 to 4k range that on a long trip can get to me. soooooo, i figured get a high flow cat and call it a day.

when i went from stock exahust to test pipe with stock exhaust the volume was night and day diferent. so i am hoping for a similiar effect.

anyways, heres my choices.

asura 3" hfc which is not in stock

berk 2.75" hfc which is in stock

3" ultimate racing hfc dont know if its in stock

anyways, which do you think would at least flow as well as my 2.5" resaonted test pipe? i was hoping that the net effect betweeen bigger pipe and cat it would be a wash.

also, tell me if i am over thinking this. i want quiter exhaust with out going backwards in power, if this is possible. lemme know.


http://www.ultimate-racing.com/Products2/S...K_Exhaust.shtml


http://www.berktechnology.com/shop/product...ID=100&P_ID=425

 

just so you know man... a high-flow cat isn't gonna make it much quieter then what u have right now. Maybe like 5-10% quieter... and you will make a few less ponies.


I had a Berk Cat before and i wouldn't reccommend it because your boosted. All it takes is for the car to backfire once and it will destroy the metal mesh inside the Cat... Then it will clog up the exhaust. But maybe they fixed that issue but it happened to me twice. and a numerous amount of people who have had it happen to them too.

 

well that kinda sucks. i was hoping for a similiar effect to oem cat vs test pipe. hmmmm. and i def dont wanna destroy it thru a backfire thats for sure. hmmmm

 

You're bottle necking at the 2.5" test pipe. Just get a 3" resonator and throw it on where the test pipe is. I have 3" single with one resonator and a 75mm HKS Hi power Ti muffler and it isn't very loud IMO, no cat either...and you have dual so it should be quieter. And a cat will hurt you're power...being FI exhaust flow is EVERYTHING!

 

Just an FYI, and I don't know if this comes with the 9 year wait for headers but Hytech offers high flow cats made from a renault piece on their website.


I have the berk, maybe I should ditch it.

 

I'm not disagreeing completely with what most of you guys said, but I've actually done this exact switch myself.

I went from a Berk TP to a Berk HFC, and did a back to back dyno to show the difference. Here is the thread I made showing the difference.

https://www.s2ki.com/forums/index.php?showt...&#entry13925994

My conclusion was that the Berk HFC was nearly just as efficient as the TP, but it did make my exhaust sound much quieter, and best of all, no more nasty smell when I'm stopped at a light! (my main reason for the switch).

Each setup was dyno at least 3 times, and I lost 2 hp and 2 tq at peak. I think the trade off is well worth it.

 

ur test was 2.5" tp vs 2.5" hfc right? hmmm, see this kinda stuff makes me feel good about trying this option. i would be doing a larger dia cat so i really am hoping for a wash on power.

guess i need to make a decision to try this.

 

i say get this today and take your OEM cat to a local muffler shop and have tem utilize your OEM mounting points and flanges. They can weld this together and it's 3'' bro.

http://www.jegs.com/i/Dynatech/329/79-400300/10002/-1

i run dyna-tech's on my truck....they flow great.

 

Yep, 2.5" TP to 2.5" HFC.

As for 2.5" HFC vs 3" HFC, I think in addition to comparing just the diameter, you should also take the inner construction of the CAT itself into consideration on how well it will flow.

 

that is exactly the raeason i am reluctant to choose the ult 3" over the 2.75" berk. the berk clearly flows well...VERY WELL.

ugh, i hate overthinking things.