I did this about 8 years ago and used diferent filters and sizes. I also had the metal bent so it covered the section by the MAF. Unfortunately, it wasn't worth it in the end because more dirt did get into the engine bay. Also, the heat shield did not stay cool. You will notice the shield get hot to the touch. Another note about shielding, it is a good idea to seal the top to the hood, so the shied has to butt up against the hood so prevent the hot gases that float to the top from getting into the shielded area. I noticed different power bands with shorter filter compared to a long type filter. I even had different set-ups where the filter bent downwards. Ultimately, the sacrifice of having this type of intake was not worht it as water and dirt got into the engine, the filter will rub somewhere if not tied well and create a hole, the extra dirt that gets into the engine from the filter is not good, careful with the old with some of the filters as that can affect the MAF, and the heatshield isn't really shielding heat. I difference to the touch of the filter is probably because air is getting to it from behind the light, but also because the engine is sucking in the hot air/ hot filter and cooling it off. To get a real cmparison with temperature is to take a reading of the stock filter in its housing and compare it.