[Aku]

Apologies if repost. too lazy to search and see if it was already posted

 

[darossi3]

Man that catless system sounds DIRTY! Especially like how you can hear the turbo better.

 

[Sonic_HedgeHog]

Not real impressed... Could sound so much better. Tail pipe leaves so much to be wanted...

Why not go bigger than 2 1/2"???

 

[jdubhack]

Needs MOAR bigger!

 

[RonMaiden]

Bigger isn't always better and 2.5 might be optimum for that setup.

 

[jdubhack]

Bigger isn't always better and 2.5 might be optimum for that setup.

Stock is 2.5". Most aftermarket (FSWerks, Borla, Magnaflow) are offering 3". They just missed the boat.

 

[Robs03svt]

Magnaflow is 2.5 not 3!

 

[StingRay]

Not real impressed... Could sound so much better. Tail pipe leaves so much to be wanted...

Why not go bigger than 2 1/2"???

This! But I'm pretty sure buschur sells their catless downpipe seperate from the exhaust. So 3" catless DP + 3" FSWerks catback would probably = awesomeness!

 

[kflaig]

Stock is 2.5". Most aftermarket (FSWerks, Borla, Magnaflow) are offering 3". They just missed the boat.

Here's Buschur's rational behind using 2 1/2" vs. 3":

1. A 3" weighs more.
2. A 3" costs more.
3. The ST's engine will never produce enough power that upping to 3" from 2 1/2" is worth what you give up in weight and cost.

Here's a link to their post: http://forums.evolutionm.net/other-cars/633879-buschur-racing-2013-ford-focus-st-r-d-thread.html

 

[RonMaiden]

I dynoed my Eclipse and with a +1 size turbo up from stock I had a 2.5" turbo back setup and I swapped over to a full 3" and saw zero gains til I went up another size turbo and was pushing near 400 at the crank and then the 3" size was actually worth it.

 

[elsolo]

Stock is 2.5". Most aftermarket (FSWerks, Borla, Magnaflow) are offering 3". They just missed the boat.

Just because that is the most requested size, and therefore very popular, does not mean it is the best performing. Most aftermarket stuff for late models isn't about improving performance as much as aesthetics.

When a shop does good R&D for improved performance, you get people that want something different because they think will perform better, despite the testing and development done.

When I was hotrodding my first BBC, I went through four different cams until I finally listened. Then I got the tiny little cam Alan recommended that wasn't very "high performance" in my mind and went the fastest. Probably should have just taken the advice of the guy that builds BBC race motors and owns a dyno.

 

[RonMaiden]

I spent a lot of time at dynos watching people throw on 3" exhaust on their cars and see horsepower drop in the low range and net slower 1/4 mile times. People need to research this stuff instead of just following the gang which happens alot in the enthusiasts world.

 

[FLYLOW]

Bigger isn't always better and 2.5 might be optimum for that setup.

If a i/tune/n-a modded svt can take 3" i dont see why a turboed st cant...

 

[kflaig]

If a i/tune/n-a modded svt can take 3" i dont see why a turboed st cant...

What do you mean by "take"?

 

[FLYLOW]

What do you mean by "take"?

Well i havent tried it but hasnt tom and a few others said/gotten good results with a 3"? Dont know about the st, but i have yet to see dynos of 2 1/2 vs. 3" on the same car same day same dyno.

Same was said in the gencoupe world. I did 3" and got a better overall hp/tq curve with a 3" single exit. I guess only time will tell for the st

 

[eglove]

What's the warranty on the downpipe? Lifetime?