Any video on a 135i RissRacing Downpipe?

[F0Bman]

That is so awesome.

[Fl0rent]

Have you got an DIY for the O2 sim ?
Is it plug and play ?

[Adam@Riss Racing]

Originally Posted by Advanced

you only need the O2 sim for the catless DP and not for the catted DP correct?

Correct,

Catless would need o2 sims (Race Use Only) and the Catted will not. We have a good CEL count inside the catalytic converter which should be perfect. All cars are a little different but we have fixes for all.

[Adam@Riss Racing]

Please email for instructions. Thanks!

[BerkTechnology]

Originally Posted by darvo

I think they are 2.5" each one....
But in turbo cars, there is a never too BIG!!

You are correct. Bigger is always better with turbo.

But the OEM BMW system is not 2.5". These are German cars remember? 63.5mm is an "odd" size for them (same goes for the Jap cars).

The 135i system is a dual 60mm into a single 70mm. 2.375" and 2.75" respectively are close US equivalents.

Originally Posted by Adam@Riss Racing

That was an awesome video! Your car is very quick! I own an M5 V10 so I know how much top end these cars have. Your car pulled a few gears on it too! But yes, the restriction of stock downpipes taper to almost 1.75" near the stock turbo flange. With a nice catback system, I'm sure your car will be that much faster!

They don't taper at all. It's a straight 60mm (2.375") shot right at the ends of the stock cat/DP flanges. The rest of the stock cats/DP's are stamped sheetmetal which aren't exactly round at all.

Where did you get 1.75"???

[Adam@Riss Racing]

Originally Posted by BerkTechnology

You are correct. Bigger is always better with turbo.

But the OEM BMW system is not 2.5". These are German cars remember? 63.5mm is an "odd" size for them (same goes for the Jap cars).

The 135i system is a dual 60mm into a single 70mm. 2.375" and 2.75" respectively are close US equivalents.



They don't taper at all. It's a straight 60mm (2.375") shot right at the ends of the stock cat/DP flanges. The rest of the stock cats/DP's are stamped sheetmetal which aren't exactly round at all.

Where did you get 1.75"???

Wow,

Have you taken off your stock downpipes before? Have you seen the amount of crush bends there are on the stock downpipes? There is a reason gains of 20-30whp come from catless or catted downpipes. The stock downpipes crush to UNDER 2" close to the turbo flange. Look inside the downpipe and you will see for yourself. Anybody that has changed their downpipes can chime in and give their feedback. If the stock downpipes were 2.375" throughout, they would be a great design. Unfortunately, they're not.

[BMW135iCA]

Any video of catted downpipes yet?

chris

[Adam@Riss Racing]

Originally Posted by BMW135iCA

Any video of catted downpipes yet?

chris

up on our site now. Thanks!

[BMW135iCA]

I can't seem to find the video of catted downpipes.

Chris

[avus]

are the catted dps any quieter than the catless version?

i'm looking for the performance gains, but not too much increase in noise
last thing i want is every modded evo and sti being all intimated...

[Riss Racing]

Originally Posted by avus

are the catted dps any quieter than the catless version?

i'm looking for the performance gains, but not too much increase in noise
last thing i want is every modded evo and sti being all intimated...

Catted DPs have less noise. You must realize the videos you hear are like this

That is me ONNNNNN the car.....If you drive normally it is not loud at all.

[BerkTechnology]

Originally Posted by Adam@Riss Racing

Wow,

Have you taken off your stock downpipes before? Have you seen the amount of crush bends there are on the stock downpipes? There is a reason gains of 20-30whp come from catless or catted downpipes. The stock downpipes crush to UNDER 2" close to the turbo flange. Look inside the downpipe and you will see for yourself. Anybody that has changed their downpipes can chime in and give their feedback. If the stock downpipes were 2.375" throughout, they would be a great design. Unfortunately, they're not.

READ: "They don't taper at all. It's a straight 60mm (2.375") shot right at the ends of the stock cat/DP flanges. The rest of the stock cats/DP's are stamped sheetmetal which aren't exactly round at all."

Forward of the cats it's all stamped parts. It's not tube at all. Yes, I've removed my fair share of downpipes on the N54 and other race cars as well.

But I took some stock DP/cats I have here, and at the ID of the flex section it looks like it does taper down to under 2". But you don't ever take ID measurements. That'd be like saying your downpipes are 2.88" ID downpipes instead of 3" downpipes.

But nevertheless, set of your's or any other catless DP's would be a welcome edition to the car.

[BMW135iCA]

Where are the videos of catted downpipes, I can't find them.

Chris

[135-CS]

I would like to hear a set of DP,s Catless with BMW Performance Catback.

Any one have this combination?

[Bullitt]

Originally Posted by 135i-CS

I would like to hear a set of DP,s Catless with BMW Performance Catback.

Any one have this combination?

+1 !

[Riss Racing]

Originally Posted by 135i-CS

I would like to hear a set of DP,s Catless with BMW Performance Catback.

Any one have this combination?

I know we have two clients that recently purchased with BMW Preformance Catback. Let me track them down and see if I can get some video for you. Or if anybody has RR DP & BMW PC please post video!

[135-CS]

Originally Posted by anthony@rissracing

I know we have two clients that recently purchased with BMW Preformance Catback. Let me track them down and see if I can get some video for you. Or if anybody has RR DP & BMW PC please post video!

Excelent Anthony keep us informed!!! I am looking forward on this to decide on catted or cat-less.

[Adam@Riss Racing]

Originally Posted by BerkTechnology

READ: "They don't taper at all. It's a straight 60mm (2.375") shot right at the ends of the stock cat/DP flanges. The rest of the stock cats/DP's are stamped sheetmetal which aren't exactly round at all."

Forward of the cats it's all stamped parts. It's not tube at all. Yes, I've removed my fair share of downpipes on the N54 and other race cars as well.

But I took some stock DP/cats I have here, and at the ID of the flex section it looks like it does taper down to under 2". But you don't ever take ID measurements. That'd be like saying your downpipes are 2.88" ID downpipes instead of 3" downpipes.

But nevertheless, set of your's or any other catless DP's would be a welcome edition to the car.

Thank you. I apologize if I came off rude, but just wanted to make sure others didn't think the stock downpipes were 2.375" in case they misread the statement. Yes, you are abosolutely right. The stock downpipes are more oval than round? They're also the most restrictive part of the whole system. On the catback, the exhaust is pretty straight except behind the 2ndary cats.

[Adam@Riss Racing]

Originally Posted by BMW135iCA

Where are the videos of catted downpipes, I can't find them.

Chris

Hi Chris,

let me link you for the catted. Thanks!

http://rissracing.com/videos.php