Oh no...the popo!!

Could you fill in the question marks… based on your pre and post results I wasn’t clear on the numbers.

Stillin CBE w/ stock exhaust on (A weighting) was ?? db
Stillin CBE w/ ERZ HFC on (A weighting) was ?? db
Stillin CBE w/ stock exhaust on (C weighting) was ?? db
Stillin CBE w/ ERZ HFC on (C weighting) was ?? db


Thanks man!

Stillin CBE w/ stock exhaust on (A weighting) was 78 db
Stillin CBE w/ ERZ HFC on (A weighting) was 88 db
Stillin CBE w/ stock exhaust on (C weighting) was 85 db
Stillin CBE w/ ERZ HFC on (C weighting) was ?? db (have to measure it)

Please note that these are peak levels which were obtained for a split second under WOT acceleration with the windows closed. Routine driving gives readings in the high 60s or low 70s for all of these setups. The HFC with CBE combo is as quiet as the CBE alone when cruising.

While the idea of C weighting seems like the best measure, practical experience seems like it's not accurate. C weighting supposedly measures frequencies below 500Hz which A weighting does not measure. However, just driving along on the highway with a quiet engine gives a reading in the 80s for C weighting. Thus, I don't think it works well for car dB levels. I'd focus on the A weighting levels for the best representation of loudness.

I absolutely love the HFC addition to the Stillen. The loudness is now right where I like it...not too loud, but definitely can turn a head if you drop the hammer. No drone at all and rasp is very tolerable once things have warmed up to operating temperature.

Hope this helps. I know I was on the fence for a long time worrying things would be too over-the-top. I'm glad I gave it a shot.

Thanks for the review SpearFish25, I was hoping someone would pick these up for an install. Quality looks good and the price is even better!

Nice review Fish...Thanks for the info!

+1 for you!

No problem guys. Happy to share some info and the good experience I've had thus far.

By buddy is going to let me borrow his sound meter so I hope to have at minimum a CBE base line comparisons with my Invidia Gemini CBE vs Stillin and then with the ERZ HFC's if I decide to buy them.

thanks for your order.

do you guys plan on doing a resonated HFC? Which cats are you using company wise?

No....THANK YOU, for the great price! :tup: I am excited to have them installed.

we have a resonated test pipe on the way.

we use a OEM catalytic converter manufacturer, they only make catalytic converter and sell to many company in all over the world including some company USA. " So much for Made in USA"

Thats great any time frame and price yet? Im in the hunt. Will the res help stop rasp? Im up for the first set if price is right and do you plan on doing dynos with them?

Great review! If I decide to add HFCs I think I will go with these. Can't pass up $369 shipped with what looks like exceptional quality.

Yeah, thus far I don't regret with choosing the money saving option at all. Excellent quality, easy install, sound good, and butt dyno approved.

still no cels for any ERZ HFCs? Berk seems to get alot and I hope these dont as I am ordering them on monday.