Just wondering if anyone has before and after time slips/0-60/1-4 mile etc from before and after downpipes. Perferably this being the only change other than tuning for the pipes. I have seen some butt dyno comments that elude to both better to no change comments. I know there has been documented HP increases of 10 to 20 hp range but just wondering in the real world if this really equates to quicker times? I know that 10/20HP can be hard to detect in a 4K lb car but I haven't seen any time slips or justified information to make me pull the trigger on $900 for catted pipes which I would need for emissions.

Im not sure what it equates to in the 1/4 but i like down pipes because they reduce the thermal load on the turbos and i believe they help slightly in reducing waste gate duty cycle at all boost levels

I had PPE catted that didn't clear properly but I probably would have taken them off anyway cause I couldn't feel anything or see anything in the logs.

AJPTurbo, E30, 15 psi, and a sh$t load of spark works great, no bolt-ons necessary IMHO.

When I installed mine, uh had them installed I cant say power increased. But I can say my throttle response was greatly improved. The science from what I understand is earlier/fasting spooling of turbo's. That part was real and immediate

Downpipes are the real deal, though I am basing this on BiGMaC's 2013 SHO and the PPE downpipes, and others' confirming comments.

Thanks for the responses. I just need to decide if my tight a$$ wants to spend the $.

I can verify the easier load on the turbos... before and after the wastegate duty cycle was a smidge lower... depending on the RPMs... felt like they spooled faster... you can usually find a used set in the EBPF classifieds... I think they are worth it... I did notice a .2th decrease in my 0-60 times after a tune revision with them on... not sure if the pipes or the tune made the difference... maybe a bit of both...


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I would have to say just hearing the turbos spooling after a DP install might be a clear indicator on the route to take.
I would also add that the stock DP are the true bottleneck with it's mandrel bends which limits/restricts the overall amount of exhaust flow.
I will also answer part of your question and ran a 12.79 several years back with just a weak V7 CW Tune along with an intake. Z