So as you all know.. my car (244) had this annoying issue and didn't like reving past 4000 RPM (and pinged)...
Rewind back to 2004
As I was building my b230ft on a stand I had a B23E in my car for awhile.
The exhaust on the car was a 2.5" system I had installed for my previous motor (B21FT) shown here:
In N/A form it was too loud for my tastes with only one magnaflow muffler and nothing else, so I brought it to an exhaust shop and told them to install a glass pack to quiet it down.
Anyway.. so 2005 comes around, my all new B230ft is ready to rock I drop it in the car with a 3" downpipe and connect it to my old exhaust. Figured a straight through 2.5" exhaust was good enough and I liked how quiet it was.
I drove it this way for 2005 till 2007, it saw two PAC NW meets and one dyno run in Calgary.
In October I cut up the 244s exhaust so I could use the magnaflow muffler on my 740 and found this...
Inside that supposed glass pack it's restricted down to somewhere between a 1" to 1.5" opening all the way through.
Unfortunately it still pings, but otherwise with open 3" DP this car seems to have a whole new life. It feels totally different on the butt dyno! Anyways, I was so blown away by my 1" bottle neck that I had to post.