That is a valueless modification for a few reasons.
Let me break them down:
1) If you look at your stock intake system, you notice that you have 2 intake pipes. The lower one and then the upper one that connects to that resonator.
The problem with air is that it takes the path of least resistance. So that lower tube is still providing air from right behind the headlight, and the upper tube probably is too. Not much is going to have changed with drilling a bunch of holes in the resonator, which is really there to just reduce the sound resonating in the car.
2) I have modded quite a few stock CB7 airboxes because I HATE the loud sucking and growling noise that a short ram or traditional cold air intake provide all of the time. Sometimes it is nice to not be surrounded by sucking, resonant air.
That said, the biggest limitation on that box, IMO, is the fact that the two small pipes don't really flow much air, and while not the same temp as the rest of the engine bay (since they are sucking from just behind the headlight) the air can still be relatively warm.
What I ended up doing to mine was to replace those tubes with ones more suitable to flowing more air.
My first design replaced the top tube with PVC pipe that effectively made it about 1/2 an inch larger. That seemed to improve throttle response with the F22 while keeping it stock sounding. In fact, you really couldn't tell the difference with the stock intake. I experimented with replacing it with a short ram and couldn't really tell any difference other than noise.
My second, and current setup was to take the stock box, fill in the holes and cut the one coupling off the corner, and then put a big 3" hole in the side. I got the self made intake parts from Spectre and made my own 3" pipe that went into the side of the air box and then ran down into the fender (where a normal cold air filter would be) with a velocity stack on it. It seemed to greatly improve flow and throttle response on the H22 without greatly increasing noise. In fact, my exhaust is significantly louder than the intake, which is throaty, but not massively loud.
Let me break them down:
1) If you look at your stock intake system, you notice that you have 2 intake pipes. The lower one and then the upper one that connects to that resonator.
The problem with air is that it takes the path of least resistance. So that lower tube is still providing air from right behind the headlight, and the upper tube probably is too. Not much is going to have changed with drilling a bunch of holes in the resonator, which is really there to just reduce the sound resonating in the car.
2) I have modded quite a few stock CB7 airboxes because I HATE the loud sucking and growling noise that a short ram or traditional cold air intake provide all of the time. Sometimes it is nice to not be surrounded by sucking, resonant air.
That said, the biggest limitation on that box, IMO, is the fact that the two small pipes don't really flow much air, and while not the same temp as the rest of the engine bay (since they are sucking from just behind the headlight) the air can still be relatively warm.
What I ended up doing to mine was to replace those tubes with ones more suitable to flowing more air.
My first design replaced the top tube with PVC pipe that effectively made it about 1/2 an inch larger. That seemed to improve throttle response with the F22 while keeping it stock sounding. In fact, you really couldn't tell the difference with the stock intake. I experimented with replacing it with a short ram and couldn't really tell any difference other than noise.
My second, and current setup was to take the stock box, fill in the holes and cut the one coupling off the corner, and then put a big 3" hole in the side. I got the self made intake parts from Spectre and made my own 3" pipe that went into the side of the air box and then ran down into the fender (where a normal cold air filter would be) with a velocity stack on it. It seemed to greatly improve flow and throttle response on the H22 without greatly increasing noise. In fact, my exhaust is significantly louder than the intake, which is throaty, but not massively loud.
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