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After a search, For us neophytes: You might want to buy an after-market downpipe if:
The exhaust piping leading in and out of your turbocharger contains numerous bends. Some vehicles – like large turb0-diesel trucks – have enough room in the engine bay for fairly straight exhaust tubing. Smaller vehicles can have a lot less room in the engine bay and therefore more pipe bends.
You’ve modified your turbo to run at a higher boost pressure. Some turbocharged vehicles come with a well-designed turbo exhaust system, and in these cases there is very little to gain by adding a new downpipe. However, if you increase the amount of boost on the stock turbo, you may find the increased exhaust gas output demands a larger, smoother down-pipe
The after-market downpipe is proven to improve performance. Most after-market downpipes are both mandrel-bend and larger in diameter than the stock units they replace. Therefore, they can significantly reduce restrictions and make fairly dramatic improvements in horsepower.
The exhaust piping leading in and out of your turbocharger contains numerous bends. Some vehicles – like large turb0-diesel trucks – have enough room in the engine bay for fairly straight exhaust tubing. Smaller vehicles can have a lot less room in the engine bay and therefore more pipe bends.
You’ve modified your turbo to run at a higher boost pressure. Some turbocharged vehicles come with a well-designed turbo exhaust system, and in these cases there is very little to gain by adding a new downpipe. However, if you increase the amount of boost on the stock turbo, you may find the increased exhaust gas output demands a larger, smoother down-pipe
The after-market downpipe is proven to improve performance. Most after-market downpipes are both mandrel-bend and larger in diameter than the stock units they replace. Therefore, they can significantly reduce restrictions and make fairly dramatic improvements in horsepower.
