UEL PPE & Invidia
Thread Starter
Pole Position
Joined: Apr 2012
Posts: 243
Likes: 44
From: CA
HF cats made it a lot quieter and less rasspier, and the smell is 90% better/gone (Vs. with out cats) once in a while I will smell just a little bit of exhaust gasses when I'm cranking on it and come to a stop light. I also get some nice random pops. I don't understand how people can runs these cars onthe street or daily with out cats it almost killed me lol I had a headache in 5 minutes when I didn't have them.
Lexus Champion
Joined: Oct 2005
Posts: 10,365
Likes: 2,764
From: Calgary, AB
What's up with the low dyno numbers ? Are you at high altitude by any chance? What gear did you use to dyno? RCF stock dyno in the 390 whp range and with E/H, it is typically around 430 - 440 whp range? 
Rookie
Joined: Jul 2007
Posts: 72
Likes: 20
From: California
It's a SuperFlow Dyno, not a DynoJet. I've been on a SuperFlow Dyno before and it read a lot lower than the DynoJet I was on previously.
Thread Starter
Pole Position
Joined: Apr 2012
Posts: 243
Likes: 44
From: CA
Exactly this!! The dyno operator also had a dynojet program on his laptop to convert it to a higher number to read like dynojet but I didn’t care to ask for it this time. That’s why I want to take it to a track or maybe I can have a local with EL headers race me at the track and see how everything plays out. Rolla you seen my video of me racing that 450+HP charger and winning so dyno was just for comparison.
Lexus Champion
Joined: Oct 2005
Posts: 10,365
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From: Calgary, AB
Pole Position
Joined: Feb 2017
Posts: 363
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From: Georgia
After the header install and exhaust it was loud as hell, I couldn't step on it in the city, it was annoying and the fumes were terrible. I honestly hatted it and thought I was going to pay all over again to put the stock headers back on. It was so raspy and high pitched sounded nasty to me to be honest. After the HFcats were put on it was night and day and I'm glad I didn't revert back to stock!! I don't like to be the loud annoying car every-time I hit the gas pedal, I want it to sound aggressive when I get on it.
Thread Starter
Pole Position
Joined: Apr 2012
Posts: 243
Likes: 44
From: CA
Thread Starter
Pole Position
Joined: Apr 2012
Posts: 243
Likes: 44
From: CA
Pole Position
Joined: Feb 2017
Posts: 363
Likes: 88
From: Georgia
Nope PPE took the first pipes off from my Invidia exhaust and custom fitted a new midpipe from the header back back and installed the two cats in the upper middle part where the factory cats sat (that’s why I said behind secondary O2s). From there the rest of the Invidia exhaust is bolted right up. Resonators are still on and then into the mufflers. I hope that’s not confusing. I’ll try to snap a picture soon!!
Ohhhhh so you have no primary cats but installed new secondary ones.
That makes sense and probably significantly cheaper/easier to do.
Smart move!
Thread Starter
Pole Position
Joined: Apr 2012
Posts: 243
Likes: 44
From: CA
Yea price wasn't too bad the cats are expensive and it did take PPE a full day to make the midpipe as the fabricator was super picky. I liked how he tucked them up into the chasis of the car since I'm lowered I never scrape them.