Rexpeed o2 downpipe install & review *56k gtfo!!!!*
Any updates from the 2 that purchased/installed these units?
I am looking for a cost effective o2/downpipe for my soon to come turbo swap.
Have these lasted throughout all the heat cycles? any cracking/exhaust leaks? anything weird at all?
I am looking for a cost effective o2/downpipe for my soon to come turbo swap.
Have these lasted throughout all the heat cycles? any cracking/exhaust leaks? anything weird at all?
mine has held up fine...and i have had at least two track days on them....i do have a front motor mount, which i heard helps prevent any stress on the DP
Evolving Member
Joined: Sep 2008
Posts: 389
Likes: 0
From: Maryland
Ask and you shall recieve 
There is a great book by Corky bell called "Maximum boost" I highly recommend everyone interested in learning about turbocharged cars reads this.
In short you want the largest area possible near the turbocharger because of the exhaust gas temperature. When gasses leave the turbo they are at their hottest and the least dense. As they cool they will become more dense and take up less space. For this reason you can take an exhaust that starts out larger and slowly taper it down to flow more than one that starts out smaller but maintains that diameter throughout. This is because the gasses are cooling and becoming more dense as they flow downstream. The large bellmouth type opening in the AMS Widemouth downpipes are conducive for that hot air to cool easier and actually optimize flow. In short having a smaller section at the turbo exit flowing into that same diameter piping can cause the adverse back pressure effect. There is a reason why our pipe has such a great increase in power. Bigger is better behind the turbo
Again I highly recommend everyone pick up the book Maximum boost...its a GREAT read!
hope that helps
Eric
There is a great book by Corky bell called "Maximum boost" I highly recommend everyone interested in learning about turbocharged cars reads this.
In short you want the largest area possible near the turbocharger because of the exhaust gas temperature. When gasses leave the turbo they are at their hottest and the least dense. As they cool they will become more dense and take up less space. For this reason you can take an exhaust that starts out larger and slowly taper it down to flow more than one that starts out smaller but maintains that diameter throughout. This is because the gasses are cooling and becoming more dense as they flow downstream. The large bellmouth type opening in the AMS Widemouth downpipes are conducive for that hot air to cool easier and actually optimize flow. In short having a smaller section at the turbo exit flowing into that same diameter piping can cause the adverse back pressure effect. There is a reason why our pipe has such a great increase in power. Bigger is better behind the turbo
Again I highly recommend everyone pick up the book Maximum boost...its a GREAT read!
hope that helps
Eric
Ask and you shall recieve
There is a great book by Corky bell called "Maximum boost" I highly recommend everyone interested in learning about turbocharged cars reads this.
In short you want the largest area possible near the turbocharger because of the exhaust gas temperature. When gasses leave the turbo they are at their hottest and the least dense. As they cool they will become more dense and take up less space. For this reason you can take an exhaust that starts out larger and slowly taper it down to flow more than one that starts out smaller but maintains that diameter throughout. This is because the gasses are cooling and becoming more dense as they flow downstream. The large bellmouth type opening in the AMS Widemouth downpipes are conducive for that hot air to cool easier and actually optimize flow. In short having a smaller section at the turbo exit flowing into that same diameter piping can cause the adverse back pressure effect. There is a reason why our pipe has such a great increase in power. Bigger is better behind the turbo
Again I highly recommend everyone pick up the book Maximum boost...its a GREAT read!
hope that helps
Eric
There is a great book by Corky bell called "Maximum boost" I highly recommend everyone interested in learning about turbocharged cars reads this.
In short you want the largest area possible near the turbocharger because of the exhaust gas temperature. When gasses leave the turbo they are at their hottest and the least dense. As they cool they will become more dense and take up less space. For this reason you can take an exhaust that starts out larger and slowly taper it down to flow more than one that starts out smaller but maintains that diameter throughout. This is because the gasses are cooling and becoming more dense as they flow downstream. The large bellmouth type opening in the AMS Widemouth downpipes are conducive for that hot air to cool easier and actually optimize flow. In short having a smaller section at the turbo exit flowing into that same diameter piping can cause the adverse back pressure effect. There is a reason why our pipe has such a great increase in power. Bigger is better behind the turbo
Again I highly recommend everyone pick up the book Maximum boost...its a GREAT read!
hope that helps
Eric
Newbie
Joined: Oct 2008
Posts: 11
Likes: 0
From: Hinesville GA
nice! im excited to get it installed with my invidia n1 CBE...but i heard a vid from the evox bbq exhaust shoot out of a rexpeed dp with a SC TP and you could hear it rattling when he revved it..do you notice any sort of rattling or metal vibration at higher rpms?
i don't recall any sort of metal rattling in the higher RPMs...maybe just a TAD...but honestly, you can't complain too much because a test pipe does give a somewhat of a rattle tin can raspy noise...granted the ultimate racing mini muffler helped alot with the noise, but probably the SC TP just doesn't muffle out the rattle
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