Simple answer that all the forums seem to agree on, and that my garage also approves is that you will get better airflow to the manifold, however unless you also adjust your ECU, and potentially replace your Mass Airflow Sensor (depending on exactly what you are changing in the airflow path) then you may have problems.

I had the full Prodrive Performance Pack added to one of my Imprezas, and the derestricting the inlet was only required for one of the performance boosts for the turbo. Without the PPP, this derestriction would not have given me any significant difference.

(I have had various modified Subarus over the years, so I chat to my local garage a lot :-) 

Is the silencer in the intake path too restrictive on the 2004 Subaru Impreza WRX?
I am new MVC user and I am trying to make shopping cart as following  MVC Music Store tutorial

I am trying to pass the radiobutton value which is different price types through actionlink.
Is it possible to pass the value with productId?
When I click the link, it will call 'AddToCart' method.
Could you help me? thanks.

Product model

namespace MvcApplication2.Models
{
public class Product
{
    [Key] public int productId { get; set; }
    public int categoryId { get; set; }
    [Required(ErrorMessage = "Product model name is required")]
    public String model { get; set; }
    [DisplayFormat(DataFormatString = "{0:0.#}")]
    public decimal displaySize { get; set; }
    public String processor { get; set; }
    public int ramSize { get; set; }
    public int capacity { get; set; }
    public String colour { get; set; }
    public String description { get; set; }
    public decimal price { get; set; }
    public decimal threeDayPrice { get; set; }
    public decimal aWeekPrice { get; set; }
    public decimal twoWeekPrice { get; set; }
    public decimal aMonthPrice { get; set; }
    public decimal threeMonthPrice { get; set; }
    public decimal sixMonthPrice { get; set; }
    //public decimal sixMonthPrice { get { return price * 0.25M; } }
    public int stock { get; set; }
    public virtual Category Category { get; set; }
}
}


details.cshtml

@model MvcApplication2.Models.Product
&lt;td&gt;
        Rental Period: &lt;br /&gt;
        @using (Html.BeginForm())
        { 
            &lt;div class="display-label"&gt;
            @Html.RadioButtonFor(model =&gt; model.price, Model.threeDayPrice) 
            3 day: £@Model.threeDayPrice
            &lt;/div&gt;
            &lt;div class="display-label"&gt;
            @Html.RadioButtonFor(model =&gt; model.price, Model.aWeekPrice)
            1 week: £@Model.aWeekPrice 
            &lt;/div&gt;
            &lt;div class="display-label"&gt;
            @Html.RadioButtonFor(model =&gt; model.price, @Model.twoWeekPrice)
            2 week: £@Model.twoWeekPrice 
            &lt;/div&gt;
            &lt;div class="display-label"&gt;
            @Html.RadioButtonFor(model =&gt; model.price, @Model.twoWeekPrice)
            1 month: £@Model.twoWeekPrice 
            &lt;/div&gt;
            &lt;div class="display-label"&gt;
            @Html.RadioButtonFor(model =&gt; model.price, @Model.threeMonthPrice)
            3 month: £@Model.threeMonthPrice 
            &lt;/div&gt;
            &lt;div class="display-label"&gt;
            @Html.RadioButtonFor(model =&gt; model.price, @Model.sixMonthPrice)
            6 month: £@Model.sixMonthPrice 
            &lt;/div&gt;
        }      
    &lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p class="button" style="margin-left:200px; width:90px;"&gt;
    //Is it possible to submit the selected radiobutton value through this?
    @Html.ActionLink("Add to cart", "AddToCart", "ShoppingCart", new { id = Model.productId }, "")
&lt;/p&gt;


---Added controller---
ShoppingCartController.cs

 public ActionResult AddToCart(int id)
    {
        // Retrieve the product from the database
        var addedProduct = db.Product
            .Single(product =&gt; product.productId == id);

        // Add it to the shopping cart
        var cart = ShoppingCart.GetCart(this.HttpContext);

        cart.AddToCart(addedProduct);

        // Go back to the main store page for more shopping
        return RedirectToAction("Index");
    }

