What size are your downpipes on your x35

[boost3d]

Hi guys

I'd like to know if you have fitted dp's to your car, which size you have gone with.
Alot of people have said that there is no real benefit in going full 76mm because
A) it's harder to install
B) it's very close to the steering rack
C) the only real difference is in the tone

 

[Twinz]

Try go 76mm (3" inches) in diameter. The space is tight but that is exactly why you want to reduce as much backpressure as the DPs run off the turbos by opening the diameter of the DPs. :thumbs:

 

[boost3d]

Thank you for your input Twinz as always your always willing to share information and shed light on the situation

 

[bmsportzn135i]

Ive got the 73mm (3") BMS downpipes installed. And what i can warn every one about, they are very noisy. I had the performance exhaust fitted by BM a few years back, and it sounded amazing, now with the DPs and and performance exhaust its a whole new noise level. So caution!

 

[bilal04]

5" cpe downpipes

 

[RowenS]

Think the Akra is 63mm.

 

[Twinz]

Bilal is refering to the single DP for the N55 motor.

I am assuming G_Spec was inquiring about the N54 motor - two DPs in a confined space. :thumbs:

 

[boost3d]

The reason why I am actually asking is because I am planning on doing downpipes on my car and I have some access to some exhaust heat wrap which I would like to use on my 'future' dp's ... The heat wrap will assist in keeping some of the heat out of the engine bay as well as decreasing the heat near the footwell area inside the car. But I don't think I would be able to wrap the twin 76mm's due to spacing constraints :bangdesk:


Powdercoating is an option but its not exactly cheap, whereas the exhaust bandage is sitting in my garage unused at the moment

 

[Twinz]

I dont see a need to wrap the DPs for daily use and space is too confined if you going the 3" route. I can see the value for race cars spending plenty time on the track. Coating the DPs is a great idea but may be expensive but a better option than wrapping. My first pair of DPs were coated.

 

[boost3d]

I dont see a need to wrap the DPs for daily use and space is too confined if you going the 3" route. I can see the value for race cars spending plenty time on the track. Coating the DPs is a great idea but may be expensive but a better option than wrapping. My first pair of DPs were coated.

Twinz I think you should sell those first pair of downpipes to me
They will go to a good home :fencelook:


Thank you again for the invaluable advice !

 

[tmos]

Hi guys

I'd like to know if you have fitted dp's to your car, which size you have gone with.
Alot of people have said that there is no real benefit in going full 76mm because
A) it's harder to install
B) it's very close to the steering rack
C) the only real difference is in the tone

Go 76mm. Fitment is tricky but if installed by an experienced tech you will not have issues. Have been running a pair since September 2012 :inlove: I use my car daily, at least 100km/day. No issues with heat so no wrapping necessary.

 

[Sleeper135i]

Just fitted 76mm down to 63mm pipes. ceramic coated.

Coated in MCX and TLHP . inside and out by Powerkote. R500 for each pipe which is cheap considering the cost of the pipes and should hopefully keep some of the heat from creeping into the engine bay. will dyno this week if I get time.

I have had lots of parts coated in this for race car applications and makes a big difference in heat control. Has kept the engine bay surprisingly cool after track sessions

 

[Rolf]

Just fitted 76mm down to 63mm pipes. ceramic coated.

Coated in MCX and TLHP . inside and out by Powerkote. R500 for each pipe which is cheap considering the cost of the pipes and should hopefully keep some of the heat from creeping into the engine bay. will dyno this week if I get time.

I have had lots of parts coated in this for race car applications and makes a big difference in heat control. Has kept the engine bay surprisingly cool after track sessions

This is the ONLY way to go :thumbs:

 

[boost3d]

Nicely done Sleeper! If/when I get dp's fitted i wouldn't mind sucking it up and paying the 1000 to have it ceramic coated . What was also nice is that they did both the inside and outside for you.

All I can ask is where are the pics

 

[1Darkknight35]

Just fitted 76mm down to 63mm pipes. ceramic coated.

Coated in MCX and TLHP . inside and out by Powerkote. R500 for each pipe which is cheap considering the cost of the pipes and should hopefully keep some of the heat from creeping into the engine bay. will dyno this week if I get time.

I have had lots of parts coated in this for race car applications and makes a big difference in heat control. Has kept the engine bay surprisingly cool after track sessions

powerkote is a great company to work with and found great drop in temps after doing my 3" BMS down pipe with MCX and TLHP, on my N55.

and for the money its worth it :thumbs:

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differant colours options for MCX ....

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Colour options for MCX...

 

[Sleeper135i]

Nicely done Sleeper! If/when I get dp's fitted i wouldn't mind sucking it up and paying the 1000 to have it ceramic coated . What was also nice is that they did both the inside and outside for you.

All I can ask is where are the pics

Get it coated rather Rosh! :thumbs:

 

[George Smooth]

I agree with Sleeper as well. Coating is the best option if it can be afforded.
76mm is the way to go if you planning on pushing the last kw out of the car. The DP must taper down though to the exhaust size.
More important than size is the quality of the downpipe and how much the welds have penetrated the inside of the DP. I went with AR because their quality in this aspect is second to none.