Hi All, I have a question (and it might be a rerun, although i did a search but came up basically empty...nothing in the dyno section, nothing in the modification section... but i might have overlooked things? ) so please forgive me if i should have done my homework better!

I am researching into the possible (engine) bolt-on tuning options.
Intake and exhaust and headers seem to be the major things.
Now, i live in a quiet neighborhood, and i have a job that does not 'agree' with a LOUD exhaust... so to do all three is probably going to be to loud...so I was thinking about just doing the headers... cause they might give the highest gain?
(i saw the video with the different combo's.... i like the dark sound of the ISS DES exhaust a lot, especially with the headers, but i just think it might be to loud?)
The questions:
1. are there data on decibels on the different systems and combo's?
2. the soundbite-video is enlightening ...did anybody ever do something similar with dyno-results?
2a. does anybody have results of a dyno-run with headers only? (or intake-headers? intake-headers-exhaust?)

thanks in advance,
Paul

 

OK, cancel this question... i found my answer! in "my ISF evolution"
(used my brain upon entering search-terms and came up with the needed answer...)

thanks anyway

 

Headers only will be louder at start up , but then it quiets when it warms up, when riding you feel the motor more agressive but is not loud at all this mod will net 30 whp

 

If you are easy on the throttle in your neighborhood it will not be loud at all with Intake/Headers/Exhaust. I know many with all the bolt ons and it only screams when they get on it. I have straight pipes (no mufflers) and no secondary cats and the car is quiet under light load. But when you get on it, different story.

 

I have PPE headers with a modified stock exhaust system with hi-flow cats. The thread is here:

https://www.clublexus.com/forums/is-...n-exhaust.html

There is a video and Dyno Graphs. My system makes more low end power than a straight PPE, JoeZ, no cat exhaust system, but looses out at the top end above 5600 RPM.

For the record, I have had my system for over a year now, and for me, it was the right decision. Close to stock noise levels, makes good power, no drone and I absolutely love the sound it makes.

Lou