Question about FI / Innovate
 

I was over with Bill @ Delicious tuning yesterday getting my car tuned after installing my innovate. He took my car out for a drive and said that he noticed back pressure due to my invidia q300 and the use of chevron gas causing him to remove about 10whp from the whole powerband(which i was really dissapointed). Now I thought back pressure was due to the sizing of the pipe (q300 = 60mm), but the people over at delicious are telling me to use a higher quality 2.5" like JDL, tomei, milltek etc and not a 3" pipe since higher velocity travel will cause low end torque to drop. Is the q300 that bad of a catback he stated that the design was terrible so I'd like some input here from some experts.

A Tomei EL header made my Innovate Kit come alive after running the factory header for 40K. And then I put the Delicious Flex Fuel kit on too.

the hell is wrong with chevron? unless youre using regular or midgrade...

twas what I said, I'm using 91 he said that it had something to do with techron lowering the actual octane of the gasoline and that 76 was nr1. Apparently arco is better as well and chevron is the worst. This is all what he said I mean he tuned my car and is pretty well known on the forums so I wanted some other input as well.

I plan on putting the Flex Fuel kit sometime soon as well. The problem is the back pressure of the catback he said the stock headers should be fine though I do plan on doing future upgrades for the full exhaust eventually.

I've got Tomei EL, Invidia: overpipe, ft pipe w high flow cat, and N1.

The exact quote I got from delicious

"The Q300 could be causing excessive back pressure for a multitude of reasons, but is most likely due to the design of the muffler/piping rather than the size of the piping itself. Reinforcing that is the fact that the OEM catback is actually slightly smaller in diameter than the Invidia and other 60mm systems, yet has no issue with backpressure waves. "

On my previous car, arco gave me CEL's saying bad cat. Chevron never gave me CELs. One CEL was a lean code cyl bank 4.

looking for more inputs on this

I'm sorry but this sounds like a complete load of bullshit

I have to agree. 10 HP for a cat back? Its just not that important of an exhaust component to maximize performancr I thought.

that's why I wanted more inputs, I didn't know that invidia was "bad" quality I could've sworn I did enough research about this and it's my first time hearing that it's bad quality followed by chevron being lower octane than the rest.

I don't have an innovated SC (cosworth), but I don't feel as though my Q300 has been any sort of hindrance to my performance. So... I question this.

I wish they would come back in and verify, I really don't wanna have to sell my q300 due to going forced induction I'd rather throw on a header and or frontpipe or something :/.