Axleback exhaust...backpressure??

[white03]

So I was at the muffler shop today getting a price on an axleback exhaust, and the guy there said the turbo's needed backpressure. Without backpressure he said the engine would not run as good and the turbo's would take higher RPM to start spooling up and it might cause check-engine lights to come on.

I've read a lot of post on here from guys who have done catback and axleback aftermarket exhausts and never have I seen anyone post about these after effects..

Is there any truth to what he said??

Thanx

 

[Hockster]

There is some truth to it, but most turboed cars get enough back pressure from the cats. Stingers that have gone catless have run into issues. Oil leakage and overboosting typically.

 

[eflyguy]

 

[Toddasaurus]

^This.

Thank you for posting that video. Backpressure being good is a myth. It's all about optimal flow.

As for the lack of cat causing oil leakage from our turbos, it's still not confirmed. But if it is indeed oil leakage as many speculate, then it's because we have shitty turbos with a poor design. I've never heard of nor seen this problem before, even on cheap ass eBay turbos with dumptubes and/or e-cutouts.

 

[CKeeler]

Yeah, my first thought would be “It has four catalytic converters”

All I know is with my new MBRP cat back my car has plenty of pull

 

[Socalstinga]

From my understanding, the need for back pressure is more an issue for NA cars. For turbo cars, it’s all about flow to match the output of your engine/turbo

 

[BlasterJax93]

Question on this topic... I recently put on the NGM delta axlebacks. I have noticed a slight feel in needing to press the gas a bit further down to get the same 'Jerky'/fluttery' feeling I had during low gear/high rpm's when I was running stock exhaust with DP's. Is this the reasoning why? I have not compared draggy lap times yet. I guess that's the ultimate ruling of the situation in question?

 

[Oryan]

Go find another muffler shop. A free-flowing exhaust does damn near the exact opposite of what they told you to a turbo car. More D/P across the turbine due to lower pressure on the exhaust side of the blades, turbine spins up with less exhaust energy needed than before, meaning turbo can spool at a lower RPM.