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Originally Posted by BAN SUVS
Also, the tapered part is snake oil- the end "...matches the standard WRX and STI turbocharger entry port and stud pattern and is therefore suitable for use with the stock TD04 Mitsubishi turbocharger..." That's nice, but it just means that the upstream end is larger, which doesn't help you at all really, since the OEM and most replacement uppipes are the proper diameter at the turbine end as well. But hey, it's APS, so at least it's really expensive.  |
OK, I do no know what diameter the end of the headers are vs. the turbo inlet, but assuming the inlet is smaller, a smooth taper is going to create less turbulence than just about any other shape, especialy a butt joint reduction. I also really like the design of the flex section with the internal solid section. As long as the alignment at the far end is pretty close, it will probably create less turbulance than a standard unlined flex section.
Good flow is not snake oil. What bothers me is that even though they claim 2 years of testing, where is the data from that testing... But at least they claim to have done testing. I'm not sure any of the other up-pipes have undergone much of any testing...