After a recent test I noted that the Spectre filter in my 2008 STS-V with Spectre CAI was dirty. I placed a Spectre replacement filter Spectre Performance SPE-HPR9886K Air Filter on order, but it was delayed — now due May 29. In the mean time I ordered a cleaning kit, Spectre 884820 Accucharge Filter Kit and an equivalent K&N filter, K&N RU-3100 Universal Rubber Filter
The Spectre filter in the CAI is a 6″ opening, 7.5″ base, 6.25″ length, 5″ top cone filter.
The equivalent / similar K&N arrived, and I plopped it in after work. The STS-V was hot, and heat-soaked, and it is a hot day, all of which are trouble for supercharged cars. I also don’t have a recent ‘before’ virtual dyno sequence with the STS-V hot.
This shows quite a few hp down from my last cold runs of 376 hp – 380hp, but mostly just tells me that the LC3 hates the heat.
The 0-60 time was actually fine hot, around 5.265 seconds in the HPTuner log and same on the Performancebox.
I am cleaning the Spectre filter, and re-oiling, and then we can test it back in the car next opportunity. I did reach back to find a hot run file from a while back when I was still making adjustments to the Spectre CAI shielding, and it was a close match to these hot runs.
Have you ever tested same-size Spectre filters and K&N filters back to back? What did you find?