S40 T5 Baclpressure ?
#1
11-09-2011, 09:17 AM
Join Date: Nov 2011
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S40 T5 Baclpressure ?
Hi
I was surfing the internet for a proper performance exhaust system for my 2008 Volvo s40 T5 and would like some advice please. Seems that mostly a 76mm (3") downpipe is used and then the rest of the system is reduced to 63mm and the cat is also removed and replaced by a catfooler. I have however came across 2 chaps that said they have experienced boostcontrol problems after installing the 76mm downpipe. Apparently the size of the downpipe helps to control the amount of boost ? I was also advised to do the downpipe and catfooler but to not replace the backbox to keep the backpreassure correct by some others ?
My goal is to get more power and would like some of the forums expertise please.
I was surfing the internet for a proper performance exhaust system for my 2008 Volvo s40 T5 and would like some advice please. Seems that mostly a 76mm (3") downpipe is used and then the rest of the system is reduced to 63mm and the cat is also removed and replaced by a catfooler. I have however came across 2 chaps that said they have experienced boostcontrol problems after installing the 76mm downpipe. Apparently the size of the downpipe helps to control the amount of boost ? I was also advised to do the downpipe and catfooler but to not replace the backbox to keep the backpreassure correct by some others ?
My goal is to get more power and would like some of the forums expertise please.
#2
11-10-2011, 10:23 PM
Senior Member
#3
12-01-2011, 06:20 AM
You want some backpressure but not a lot. So install a straight through desgin free flowing muffler like Magnaflow or BORLA is what your going to want to look into & or an equivalent.
As for the 3" downpipe to control boost I have never heard of this. It's a metal pipe it doesn't control boost period. Your ECU and wastegate do that. Now it may help it boost a little sooner (Spool Time) . But that is only because more airflow can get through. Your not going to gain "BOOST" by adding a downpipe. You'll gain HP and performance but if you want more "BOOST" you need a Boost Controller and or an ECU upgrade (IPD USA, BSR, RICA, SPEEDTUNING USA, UPSOLUTE...).
When you do the downpipe and catback system you want mandrel bends for a free flowing exhaust crush bends will hinder performance.
As for the 3" downpipe to control boost I have never heard of this. It's a metal pipe it doesn't control boost period. Your ECU and wastegate do that. Now it may help it boost a little sooner (Spool Time) . But that is only because more airflow can get through. Your not going to gain "BOOST" by adding a downpipe. You'll gain HP and performance but if you want more "BOOST" you need a Boost Controller and or an ECU upgrade (IPD USA, BSR, RICA, SPEEDTUNING USA, UPSOLUTE...).
When you do the downpipe and catback system you want mandrel bends for a free flowing exhaust crush bends will hinder performance.
#6
10-09-2012, 06:49 AM
